A peaceful, bottom-dwelling armored catfish that is one of the most popular and hardy beginner aquarium fish. The peppered cory thrives in active shoals and constantly forages the substrate for food.
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Small armored catfish, roughly 5-7 cm (2-3 in) long; females slightly larger and rounder.
Lifespan
5–10 years
Social needs
group
Native region
South America (La Plata basin: lower Paraná, Paraguay and Uruguay river systems across southern Brazil, Paraguay, Urugua
Origin
New World
Climate
⛅ Subtropical
Water type
💧 Freshwater
Family
Callichthyidae
Genus
Corydoras
Part of the Catfish
Catfish are a diverse order of mostly bottom-dwelling fish, including peaceful shoaling corydoras, armored loricariids, and scavengers prized for keeping the lower levels of an aquarium active and clean.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Small school sand tank
20 gal / 76 L long, sand
Corydoras species are social schoolers — keep 6+. 20-gal long is the practical minimum, with fine sand substrate (essential for barbel health), peaceful tankmates, and gentle filtration.
Recommended
Planted shoal community
29 gal / 110 L long planted
29-gal long planted community with a shoal of 8+ (same species), sand, driftwood, and peaceful tankmates. Excellent social behaviour — they constantly forage and dart to the surface together.
El fosilmaníaco / CC BY 3.0 (Wikimedia Commons)
Photo coming soon
Ideal
Amazon biotope shoal
40 gal+ / 151 L+ biotope
Amazon biotope with sand, leaf litter, driftwood, dim lighting, and a large shoal of 10+ of one species. Breeds readily in well-set-up tanks.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
House a shoal of at least six (ideally more) in a tank of 60 litres (15 US gal) or larger, with much more floor space than height since these are bottom-dwellers. Use a soft sand or smooth, rounded fine-gravel substrate to protect their delicate barbels, and provide plenty of plants, driftwood, and shaded hiding spots. A gentle to moderate current and clean, well-oxygenated water suit them best.
Peppered corys are subtropical and tolerate cooler water than many tropical fish: aim for 18-24 C (64-75 F), pH 6.0-7.5, and soft to moderately hard water. Keep nitrates low with regular water changes, and never leave them on bare-bottom or sharp-gravel tanks, which erode their barbels. They periodically dart to the surface to gulp air, so leave a gap between the water line and the lid.
Substrate
Fine, smooth sand is essential so these corys can sift food and forage without eroding their sensitive barbels; sharp gravel causes barbel infections and erosion. Keep the sand clean to prevent gas pockets and bacterial buildup.
Equipment & setup
A 20 gallon long or larger tank with a gentle filter and good surface agitation keeps them oxygenated; peppered corys (paleatus) tolerate cooler water and do best at 64-77F, so a heater may be optional in a warm room. Provide shaded areas with plants, driftwood, and broad leaves for cover.
Diet
Omnivorous scavengers that eat sinking pellets, wafers, and granules, plus frozen or live bloodworms, daphnia, brine shrimp, and blanched vegetables. They are not algae-eaters and must be fed a complete diet rather than relying on tank leftovers.
Feed once or twice daily, offering only what they finish in a few minutes. Because they feed at the bottom, choose sinking foods and make sure faster mid-water tankmates do not outcompete them. Occasional protein-rich treats support good condition and breeding readiness.
Behavior & temperament
Highly social and peaceful, corys are happiest in groups where they forage, rest, and dash to the surface together; kept singly or in pairs they become stressed and withdrawn. They are active during the day, sift sand through their gills, and are completely safe with other community fish.
Enrich their environment with open sand for digging, leaf litter, caves, and live plants. Watching a shoal work the substrate is part of their appeal. They mix well with small tetras, rasboras, and other gentle community species, and activity is greatest when they feel secure in numbers.
Health
The most common problems are barbel erosion and infection from sharp or dirty substrate, and red-blotch or fin damage from poor water quality. Maintain pristine water, soft substrate, and stable parameters to prevent these issues. Corys are also sensitive to many medications, salt, and copper, so dose conservatively.
They can suffer from internal parasites or bloating if overfed, and from suffocation if surface air-gulping is blocked. Quarantine new arrivals, avoid sudden temperature swings, and watch for clamped fins, lethargy, or rapid surface breathing as early warning signs.
Tips, DIY & hacks
Always keep 6 or more of the same species, as they are highly social and shoal together; sinking wafers and frozen bloodworms after lights-out ensure they get enough food. A bare patch of clean sand near the front gives them a foraging zone you can target-feed, and peppered corys will spawn readily with a cool water change.
