Aspidoras Spilotus C125 3cm

Name & Origin

The genus name Aspidoras is built from two Greek roots — aspis, meaning shield, and doras, meaning skin or hide. The shield-skin reference is to the same double row of armoured bony plates (scutes) that run along the flanks of every member of the subfamily Corydoradinae, a defensive feature the genus shares with its more famous cousins Corydoras, Scleromystax, and Brochis. The species epithet spilotus is a direct Greek-derived reference to the fish’s most obvious feature in the tank: spilos means spot or stain, and spilotus therefore translates loosely as ‘the spotted one’ — an honest, plainly descriptive name for a small catfish whose body is scattered with discrete dark spots across a pale silvery-bronze background. The species was formally described in 1996 by Nijssen and Isbrücker, two Dutch ichthyologists whose combined work on South American armoured catfishes underpins a substantial fraction of modern Corydoradinae taxonomy.

The trade code ‘C125’ stamped on shipments of this species deserves a short explanation for aquarists who have encountered the more familiar L-number system used for plecos. The C-number system is a parallel catalogue maintained by the German aquarium hobbyist community — specifically the magazine DATZ (Die Aquarien- und Terrarien-Zeitschrift) — that assigns provisional codes to undescribed, newly imported, or not-yet-confidently-identified Corydoradinae catfishes. Where L-numbers run across the loricariid (pleco) family, C-numbers are restricted to the Corydoradinae: Corydoras, Aspidoras, Scleromystax, and Brochis. A C-number is assigned when a new collection of catfish arrives in the trade and cannot be confidently matched to an existing species description; the code then sticks as a useful commercial label even after the fish is formally described. C125 was assigned to this spotted Aspidoras in the early 1990s and continued to be used in the trade even after Aspidoras spilotus was formally described in 1996, which is why many shops, wholesalers, and breeders continue to sell the fish by the C125 label today. The two names are equivalent: Aspidoras spilotus and Aspidoras C125 are the same species, and any shop stocking one is stocking the other.

To the untrained eye, any Aspidoras looks simply like ‘a small cory’ — the body shape, the double row of scutes, the forked caudal fin, the three pairs of barbels, and the characteristic bottom-grubbing behaviour are all hallmarks of the broader corydoradine catfish. To the taxonomist and the serious aquarist, however, Aspidoras is distinct from Corydoras in several subtle but diagnostic features. The most important is the cranial fontanel, a soft-spot opening in the top of the skull. In Aspidoras the fontanel is noticeably larger and more elongated than in Corydoras, a feature visible on good museum specimens and occasionally detectable on live adult fish under careful observation from above. Aspidoras also tend to show a more slender, elongated body profile (less ‘stocky’) than typical Corydoras, and most Aspidoras species remain smaller at full adult size — several species, including A. spilotus, mature at just three-and-a-half to four-and-a-half centimetres, compared with the six-to-eight-centimetre range common among the most popular Corydoras. Most Aspidoras species, including A. spilotus, are also geographically restricted to eastern and north-eastern Brazil — a region of strongly seasonal, often drought-prone coastal drainages that has produced a rich and localised radiation of small armoured catfishes. Aspidoras spilotus itself is associated primarily with the Rio Itapicuru basin in Bahia state, and within that basin is typically collected from clear-to-lightly-tannin sandy tributaries, pools, and shaded backwaters, over fine pale sand with abundant leaf litter. The water is soft, gently acidic to near-neutral, warm by day and noticeably cool by night — a profile that explains both the species’ tolerance of a relatively broad temperature range and its clear preference for the cooler end of the typical tropical aquarium spectrum. The broader practical lesson is important: Aspidoras are not simply ‘small Corydoras’, and an aquarium copied wholesale from a standard Corydoras sterbai display tank will usually run too warm, too hard, and too coarse-substrated for an Aspidoras spilotus to be genuinely comfortable.

Tank Setup

The tank setup for Aspidoras spilotus is built around three non-negotiable priorities: a fine sand substrate, dense planting with open foraging lanes, and enough horizontal footprint for a genuine school. A 60-litre tank with a long footprint (for example 60 by 30 centimetres, or 80 by 25 centimetres) is the practical minimum for a school of six; 80 to 100 litres allows for a comfortable group of eight to twelve and produces the most natural, constantly-moving schooling behaviour for which this species is valued. Tall, narrow, or cube-shaped tanks are a poor fit — Aspidoras are strictly bottom-dwellers, and floor area matters far more than total water volume or column height. A long, shallow rectangular tank is always a better choice than a tall cube of the same capacity for this species.

Substrate is the single most important physical element of the tank and non-negotiable for this genus. Aspidoras spilotus spend the majority of their waking life probing the substrate with their three pairs of barbels, and anything other than smooth, fine-grain sand will damage those barbels within weeks to months. Use fine aquarium sand (particle size around 0.1 to 0.5 millimetres) — natural river sand, pale silica pool-filter sand, fine black blasting-grit sand, or similar smooth-grained products specifically safe for corydoradine catfish. Gravel, crushed coral, lava rock, or any sharp-edged substrate is strictly unsuitable; even ‘smooth’ small-gauge gravel will erode barbels over the long term because the fish cannot push through it the way they push through sand. Damaged barbels do not generally regrow, and chronic barbel erosion leads to secondary bacterial infections that are difficult to treat and shorten the fish’s life considerably. The choice of substrate colour also affects how well the fish’s scatter-spot pattern displays: on dark sand the bronze tones deepen and the spots appear sharper, while pale buff or natural silver sand gives a brighter, more biotope-accurate look at the cost of slightly washing out the fish’s contrast. Either is acceptable; bright white pool-filter sand is less recommended because it reflects too much light back up at the fish and tends to produce visibly nervous, paler-coloured schools.

Layer the tank with moderate to dense planting — enough to create shaded resting pockets and break sightlines across the tank, but with open patches of open sand along the front and centre of the tank where the school can forage freely. Anubias and java fern attached to driftwood, a few clumps of cryptocoryne in the midground, and a backdrop of taller stems such as Vallisneria, Hygrophila, or Limnophila create a workable visual balance. A few pieces of smooth, gnarled driftwood, some rounded river stones, and a generous scatter of dried Indian almond leaves or beech leaves on the substrate complete the habitat — producing mild tannins, slow-release biofilm, and abundant natural cover. The leaf-litter layer is particularly valuable for a biotope-accurate Aspidoras setup: in the wild these fish live among and beneath the slow-decomposing leaf matter that accumulates along Itapicuru tributary margins, and a modest leaf-litter layer in the aquarium provides natural hiding spots for juveniles, a substrate for beneficial microfauna, and a tannin source that gently softens the water as it breaks down over time. Replace leaves gradually every three to six weeks rather than all at once, to avoid sudden changes in tannin load.

Lighting should be low to moderate — the species prefers subdued lighting and will display better colour and more confident foraging in a dimmer tank than under bright, open LED fixtures. If the tank is heavily planted with light-demanding species, consider using floating plants such as Amazon frogbit, salvinia, or red-root floaters to shade the lower levels of the water column while still providing high light for the substrate-level plants that need it. Dimmable LED units are a worthwhile investment for any Aspidoras tank; they allow the keeper to run bright light during the day for plant health and drop the intensity noticeably during feeding and viewing sessions, when the fish will come out more confidently. A well-fitted lid is recommended mainly to reduce evaporation, stabilise temperature, and prevent stray jumping, although Aspidoras are not notorious jumpers in settled tanks with appropriate tankmates. Tank maintenance routines should respect the fish’s calm preferences: slow, gentle water changes rather than sudden large-volume changes (except when deliberately triggering spawning), careful substrate siphoning that avoids startling resting fish, and patient replacement of leaves and botanicals as they decompose over a period of several weeks.

Water Parameters

Aspidoras spilotus sits firmly at the cooler, softer end of the tropical aquarium range, and the single most common mistake made with this species in the home aquarium is treating it as a generic warm-water tropical — running the tank steadily at 27 or 28 °C alongside discus, angelfish, or true warm-water Corydoras such as C. sterbai. Aspidoras spilotus will tolerate such temperatures for short periods, but long-term exposure to temperatures above about 26 °C measurably reduces activity, shortens lifespan, and lowers breeding success. The species’ natural habitat in the Itapicuru basin is warm by day but cool by night and through the dry season, and the fish are clearly adapted to daily and seasonal temperature swings rather than to constant high heat. A daily target of around 24 °C, with allowance to drop to 22 °C in winter or rise briefly to 26 °C in summer, is ideal — and in many temperate climates a typical room-temperature aquarium will suit the species without a heater at all for much of the year. In warmer climates (including most of Australia during summer), an aquarium chiller or at least a cooling fan directed across the water surface can be genuinely necessary during heatwaves to keep the tank below the critical 26 °C threshold. Australian keepers should pay particular attention to aquarium cabinet ventilation: a closed cabinet with a hot pump and LED lighting can push tank temperatures several degrees above room temperature surprisingly quickly during a hot week.

Water chemistry should lean soft and slightly acidic to near-neutral. A pH around 6.6, with hardness in the 3 to 6 dGH range, most closely matches the Itapicuru collection-site water and will bring out the best colour, activity, and breeding condition in the fish. The species is genuinely tolerant of somewhat harder, more neutral tap water, and can be kept healthy and active up to around pH 7.5 and 10 dGH, but soft water is not merely tolerated — it is preferred, and should be treated as the default target rather than as an exception for advanced keepers. Tannin-stained water, created with Indian almond leaves, oak leaves, or a small amount of alder cone, is appreciated by the fish and mimics the natural biotope closely; the tannins also provide mild antibacterial and antifungal benefits that are particularly useful in a sensitive-catfish tank. For aquarists with hard tap water, options for softening include a modest proportion of RO (reverse osmosis) water mixed with tap, the use of commercial peat-based or alder-based substrates, or heavy reliance on leaf litter and driftwood to drive natural pH and hardness reduction over the first weeks and months of the tank. Avoid aggressive chemical pH-down additives — they destabilise the water, cause swings that are particularly stressful to sensitive catfish, and generally cause more problems than they solve in a soft-water biotope.

Water quality matters as much as water chemistry, and arguably more. Like all corydoradine catfish, Aspidoras spilotus spends effectively its entire life in direct contact with the substrate and is therefore more exposed to nitrate build-up, fine organic waste, and any bacterial or fungal activity on the tank floor than mid-water or surface fish. Nitrates should be held below 20 ppm through regular gentle substrate siphoning and weekly water changes of 25 to 30 per cent. Ammonia and nitrite must be zero — the species is quite sensitive to any detectable level of either, and new tanks should be fully cycled before a school of Aspidoras is introduced. Dissolved oxygen should be high, especially if the tank trends toward the warmer end of the temperature range, as oxygen solubility drops as temperature rises. Like all cory-type catfish, Aspidoras spilotus will occasionally dash to the surface for a small gulp of air — this is a normal secondary respiration behaviour of the genus and is not a sign of oxygen starvation, but markedly increased frequency of surface gulping across the whole school can indicate a genuine water-quality problem worth investigating immediately. If the entire school is hovering near the surface for extended periods, test water parameters without delay and perform a large, gentle water change while the investigation continues.

Diet & Feeding

Aspidoras spilotus is a small-mouthed omnivorous bottom feeder, and its feeding strategy in the aquarium must reflect that fundamental ecology. The fish is physically incapable of meaningfully competing with mid-water or surface feeders, and relying on ‘whatever happens to drift down to the bottom’ is a reliable path to slow malnutrition — an outcome that is distressingly common in community tanks where the owner has assumed the catfish will ‘sort themselves out’. The staple diet should be small sinking pellets, micro-granules, or crumbled wafers specifically formulated for bottom-dwelling catfish: high protein, nutrient-dense, and sized appropriately for a three-to-four-centimetre catfish mouth. Standard full-size Corydoras pellets are often too large for Aspidoras spilotus and should either be crushed between fingers before feeding, or replaced with dedicated micro-pellet and granule formulations designed for small fish. Look for products that list a mix of animal protein (krill, shrimp, fish meal, insect meal) alongside plant matter such as spirulina, and are labelled as fast-sinking rather than slow-sinking — Aspidoras feed most efficiently on food that settles onto the sand immediately and stays there, rather than drifting through the water column where tankmates can intercept it.

Supplementary frozen and live foods are essential for long-term condition and are effectively mandatory for breeding conditioning. Frozen daphnia, cyclops, micro-bloodworm, and baby brine shrimp are all excellent and widely available. Live microworms, Grindal worms, vinegar eels, and live baby brine shrimp, when obtainable, produce visibly improved colour, fuller body condition, stronger pre-spawn female rounding, and noticeably more active schooling behaviour within days of introduction. Feed in the evening or shortly after the tank lights dim, when Aspidoras spilotus becomes noticeably more active and more confident at the front of the tank; feeding in the middle of the day in a brightly-lit community tank often means mid-water tankmates consume most of the ration before it reaches the substrate. Blanched vegetables are not a major dietary requirement for this species, although very small pieces of blanched zucchini, spinach, or cucumber will sometimes be accepted as light variety; they are best viewed as an occasional supplement rather than a staple. Naturally occurring biofilm on driftwood, almond leaves, rocks, and the substrate itself contributes a surprisingly meaningful proportion of the fish’s total daily intake in a well-matured tank — another reason to favour an established, lightly-botanical setup over a sterile, bare-substrate display tank.

Feed small amounts twice a day rather than a single large feeding — small, frequent feeds match the species’ natural grazing behaviour, reduce local waste accumulation, and ensure all members of the school get a share. Delivering food in two or three small portions also gives slower or more timid individuals within the school a better chance to feed before the bolder fish monopolise a single larger meal. Watch the fish rather than the clock: a well-fed Aspidoras spilotus has a gently rounded belly when viewed from above, not a hollow or visibly sunken ventral profile. Chronic underfeeding manifests as a visibly sunken belly, paler and softer colouration, reduced activity, and an increasingly listless school — all of which should trigger an immediate review of feeding frequency, food delivery method, and tankmate competition. Keeping a simple feeding log for the first few weeks after introducing a new group is a good discipline and helps catch problems early, particularly in a community tank where the Aspidoras are not the visually dominant species and can quietly decline without being noticed.

Colour Varieties

In the tank, Aspidoras spilotus presents as a quietly attractive rather than a showy fish — but at close range, particularly against fine pale sand under subdued lighting, the scatter-spot pattern is one of the more distinctive looks in the small-catfish trade. The body base colour is a soft, slightly metallic silvery-bronze, sometimes tipping toward a warm pale gold on the flanks of well-fed adults. The key distinguishing feature is the pattern of discrete, rounded dark spots scattered across the upper two-thirds of the body — these are not fine speckles fused into a cloudy dusting (as in rochai), nor a continuous lateral stripe (as in pauciradiatus), but individual, more-or-less separate spots, each clearly definable, arranged in a loose, visually pleasing scatter rather than in organised rows. The spots tend to be slightly larger and more widely spaced toward the dorsal line, and smaller and more frequent along the mid-flank. The belly and lower flanks are cleanly pale and largely unmarked. A faint darker saddle often sits just in front of the dorsal fin, and a very subtle darker shading can be visible across the caudal peduncle, particularly in breeding-condition adults.

Colour and pattern intensity vary noticeably with substrate colour, lighting, water clarity, and fish condition. On pale sand under bright open lighting the fish can appear washed out and almost silvery-grey, with the spots fading to soft smudges; on dark or mid-tone sand under dimmer, biotope-style lighting the base tone deepens to a warmer bronze, the spots sharpen to near-black, and the overall pattern becomes strikingly graphic. A mature, well-fed, relaxed schooling Aspidoras spilotus in a well-matured tank will show a clean bronze base with crisp spots and a quiet almost-sheen along the flanks; a stressed, newly-imported, or poorly-fed fish will look pale, grey, and visibly washed out, often with softened, blurred spotting. Colour therefore serves as a useful daily welfare check: consistent sharp spotting and warm bronze base tones are reliable signs that husbandry is on track, while gradually blurring spots and paling base colour should prompt a review of water parameters and feeding routines.

One practical identification tip is worth knowing at the point of purchase. Aspidoras spilotus is most easily confused with Aspidoras rochai and with the similar but slightly coarser-patterned Aspidoras C141; the single clearest way to tell them apart in a mixed shop tank is to look not for the presence of dark marking, but for its structure. Aspidoras spilotus shows discrete, rounded, separable spots — you should be able to point at each spot individually. Aspidoras rochai shows fine speckling merging into an almost cloudy dusting, plus a soft horizontal band — the markings blur rather than resolve into separable points. Aspidoras C141 tends to show coarser, denser, more irregularly shaped spots that blur into one another in places. When choosing C125 specifically from a mixed Aspidoras tank, look for the cleanly spotted, moderately slender, bronze-toned fish with a neat, visually organised scatter pattern and no strong horizontal stripe. The importer’s paperwork will usually confirm the label, but an informed visual check is a valuable cross-reference. Spilotus is also noticeably more slender through the body than the stockier rochai, a secondary distinguishing feature visible in the same shop tank.

Male vs. Female

Sexing Aspidoras spilotus honestly requires patience, good overhead viewing angles, and — ideally — a group of at least six fish for reliable comparison between individuals. As with most small Aspidoras, the differences between the sexes are subtler than in species famous for sexual dimorphism, and attempts to sex a single pair at point of sale are very unlikely to succeed. The single most useful indicator is body shape as seen from directly above: a mature female viewed from overhead will present as a slightly broader oval across the abdomen, while a mature male will look noticeably more slender and parallel-sided across the same region. This difference becomes pronounced when the female is gravid and visibly carrying eggs, but it is generally detectable even in resting, non-breeding condition once the fish have reached full adult size of around four centimetres. Viewed from the side through the front glass, both sexes look very similar, and any attempt to sex the fish purely from profile photos is likely to produce unreliable guesses.

To be frank, in juvenile or sub-adult fish under about 3 cm total length, sex differences in Aspidoras spilotus are not reliably detectable at all. The species is effectively monomorphic outside breeding condition, and any shop claim to sex fish at import size should be treated with scepticism. Dorsal fin shape is sometimes cited as a clue — mature males may show a marginally more pointed dorsal leading edge — but the overlap between individuals is very large and the character alone is not a safe diagnostic. Colour and pattern provide effectively no sex information in Aspidoras spilotus; both sexes carry identical base bronze colouration, identical scatter-spot patterns, and there is no flushed or temporary breeding colour in males comparable to what is seen in many tetras, dwarf cichlids, or killifish. The practical path for serious breeders is to purchase a group of six or more sub-adult fish from a trusted source, grow them on together for three to six months, and allow natural pairing and sorting within the school; a mixed-sex group is essentially guaranteed at this sample size, and the fish will identify and pair themselves far more reliably than any human observer can from outside the glass.

Compared with the larger, better-known Corydoras species, sexual dimorphism in Aspidoras spilotus is noticeably subtler. Corydoras sterbai females, for example, are dramatically broader than their males when viewed from above, whereas Aspidoras spilotus females are only modestly so, and the difference sometimes only becomes unambiguous when the female is actually carrying eggs in the days before a spawning event. This is an honest caveat for aquarists accustomed to sexing larger Corydoras: the same techniques apply, but the magnitude of the difference is smaller, the reliability is lower on any single individual, and group-level comparison across a full school is the only genuinely trustworthy approach. Patience, good overhead photographs, and a school with enough fish to compare — six minimum, eight to twelve ideally — are the serious Aspidoras keeper’s best sexing tools.

Breeding

Week -2 to -1

Conditioning

Feed group heavily on live and frozen foods; stable temperature and pristine water quality

Day 0

Trigger Event — Cool Soft Water Change

Large cool water change simulates the rainy-season onset in the Itapicuru basin

Day 0–1

Courtship and T-Position Mating

Males pursue female; spawning occurs in the characteristic corydoradine T-position

Day 0–2

Egg Deposition

Female attaches small clutches to plants, glass, and flat surfaces in multiple small batches

Day 3–5

Hatching

Eggs hatch into tiny, yolk-heavy fry with characteristic Corydoradinae behaviour

Day 6–14

Fry Free-Swimming and Grow-Out

Begin with infusoria and microworm; transition to baby brine shrimp from day 5–7 post-hatch

Conditioning

Spawning in Aspidoras spilotus is best triggered after a deliberate conditioning period. Feed the school generously — three or four small feedings per day — with live baby brine shrimp, microworms, frozen daphnia, cyclops, and frozen micro-bloodworm for one to two weeks. Mature females should visibly round out across the abdomen when viewed from above, and the whole school should become more active, more brightly coloured, and more visibly interactive during the daytime. Maintain pristine water quality during this period with frequent small water changes of 10 to 15 per cent twice weekly, keeping temperature and parameters steady. The goal is to bring the female fish into full egg-carrying condition while holding the group in a steady, low-stress environment.

Trigger Event — Cool Soft Water Change

The classic trigger is a 40 to 50 per cent water change with noticeably cooler, softer, and slightly more acidic water. Ideal parameters for the incoming water are pH 6.0 to 6.4, hardness 1 to 3 dGH, and temperature 20 to 22 °C — so that the tank as a whole drops by around three to five degrees after the change. This deliberate thermal and chemical shift simulates the onset of the rainy season in the species’ native north-eastern Brazilian habitat, a seasonal cue that reliably triggers spawning in both wild and captive-bred populations. Mild overnight aeration with a gentle airstone after the water change can further boost dissolved oxygen and encourage courtship. Active courtship often begins within 12 to 36 hours of the cool-water change, occasionally within minutes in well-conditioned groups.

Courtship and T-Position Mating

As with all Corydoradinae, Aspidoras spilotus spawns in the characteristic T-position. One or more males pursue the chosen female around the tank in short, darting bursts, with occasional quivering displays and nudging alongside her flanks. The female, when receptive, positions herself perpendicular to the male — forming the shape of a T, her head at the level of his vent — and briefly takes his milt into her mouth. Holding the milt briefly, she then swims to a chosen spawning surface, releases a small batch of eggs into her cupped pelvic fins, and fertilises them with the held milt as she deposits them carefully onto the chosen surface. In Aspidoras spilotus this process is relatively unhurried, with the female often visibly ‘shopping’ several surfaces before settling on a preferred deposition point.

Egg Deposition

Egg deposition sites vary between individual females and between tanks. Favourite sites in Aspidoras spilotus include the broad upper surfaces of anubias or cryptocoryne leaves, the inside of the aquarium glass (typically along the front pane near the substrate), flat exposed areas of smooth driftwood, the inside walls of clay pots or spawning cones, and occasionally the underside of a sponge filter. Eggs are small (around 1.2 to 1.5 mm diameter), pale cream to slightly amber, sticky, and attach firmly to the chosen surface via a natural adhesive. A single spawning session typically produces 20 to 60 eggs in multiple small clutches of two to six eggs each, spread across several different surfaces over a period of several hours.

Hatching

At a steady 24 °C, Aspidoras spilotus eggs typically hatch three to five days after fertilisation. As all corydoradine catfishes show no parental care and the adults will readily consume their own eggs and fry given the opportunity, most experienced breeders either remove the adult school from the breeding tank immediately after spawning is complete, or carefully transfer the eggs to a separate small hatching tank using a soft brush or pipette. A small amount of gentle aeration and a trace of methylene blue or alder-cone tannin helps prevent fungal loss of unfertilised eggs within the clutch. Newly hatched fry are very small, heavily yolk-laden, and largely inactive for the first 36 to 48 hours after hatching — this is normal and does not require intervention or feeding.

Fry Free-Swimming and Grow-Out

Once free-swimming, Aspidoras spilotus fry immediately exhibit bottom-grubbing behaviour and begin foraging actively across the substrate of the hatching tank. Begin feeding with infusoria, green water, or commercially prepared liquid fry food for the first three to five days post-free-swimming, and transition to newly-hatched microworms and baby brine shrimp nauplii from around day five to seven post-hatch. Water changes in the fry tank should be small but frequent — 10 per cent every one to two days — and the temperature should be held steady at around 24 °C. Fry grow slowly for the first month and then accelerate; expect the characteristic scatter-spot pattern to begin emerging gradually from around four to six weeks post-hatch, starting as faint grey marks and deepening over subsequent weeks. Move juveniles to a larger grow-out tank once they reach around 1.5 cm total length, and keep them on the same fine sand substrate as the adults from day one.

Community Tank Mates

Aspidoras spilotus thrives in quiet, well-matched nano and small community tanks where every resident is small, peaceful, and relatively slow at feeding. The species’ size and temperament mean that it is always the fish being considered for protection, never the one causing problems: no Aspidoras is going to bully a tankmate, but plenty of otherwise ‘community’ fish will bully or outcompete a school of Aspidoras to the point of slow decline. The ideal community is built deliberately, from the bottom up — start with the Aspidoras school (six or more fish, eight to twelve ideally), then add a single small schooling tetra in the mid-water (ember, chili rasbora, neon, or rummy nose) and a gentle upper-level presence (honey gourami, peacock gudgeon, or small pencilfish) to complete the vertical structure. A clean-up crew of Neocaridina shrimp and a few nerite or mystery snails can be added for biological interest and glass cleaning. Everything in the tank should be soft-water tolerant, cool-tropical tolerant, and genuinely gentle in temperament.

The single most common mistake with Aspidoras spilotus in community tanks is underfeeding caused by feeding-zone competition. Mid-water tetras, small gouramis, and fast-feeding dwarf cichlids will intercept sinking pellets and wafers before they reach the substrate, leaving the bottom-feeding Aspidoras hungry night after night — a pattern that can persist for weeks or months before the keeper notices the visible body condition decline. The solution is simple but must be deliberate and consistent: feed the mid-water fish first at the front of the tank with a small floating or slow-sinking food, then immediately drop a separate portion of dedicated fast-sinking micro-pellets or wafers into the substrate zone at the back of the tank. The mid-water fish will typically be distracted by the first portion long enough for the Aspidoras to find and eat their share. Feed in the evening or with dimmed lights whenever possible — the Aspidoras will emerge more confidently and feed more effectively in low-light conditions, and the mid-water fish will be slightly less active as well.

A final practical note: schooling behaviour in Aspidoras spilotus is strongly size-dependent. A group of three or four fish will appear lonely, will hide much of the time, and will show almost none of the species’ natural character. A group of six is the practical minimum for reliable schooling; a group of eight to twelve is where the fish’s genuine schooling instincts emerge — constant synchronised movement across the substrate, visible pre-spawn interactions between maturing males and females, confident feeding at the front of the tank, and the layered social behaviour that makes this small catfish so rewarding to keep over the long term. Keepers who cannot commit to a group of at least six should choose a different species rather than attempt a ‘mini school’ that does not work.