Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

This armored catfish is generally peaceful towards other species and displays active, social behavior within its group. However, males can become highly territorial and protective when guarding their bubble nests during spawning. Additionally, because of their size and wide mouth, they may opportunistically consume very small fish or fry.

Diet

Omnivore

They are omnivorous generalists that will readily accept a wide variety of aquarium foods. A diet consisting of high-quality sinking pellets, tablets, and wafers should be supplemented with live or frozen foods such as bloodworms, tubifex, and brine shrimp. They prefer to feed at night, so adding food shortly before turning off the aquarium lights is highly beneficial.

Life expectancy

5-8 years

Under optimal aquarium conditions, Callichthys callichthys typically lives for 5 to 8 years, though some individuals may reach up to 10 years with exceptional care. Providing clean water, a low-stress environment, and a varied diet are key factors in maximizing their lifespan. Regular substrate vacuuming is also crucial to protect their sensitive barbels from bacterial infections.

Sex ratio

Group

These catfish are highly social and thrive when kept in groups of five or more individuals of mixed sexes. There is no strict male-to-female ratio required, though having multiple females per male can reduce potential territorial squabbles among males during the breeding season. Providing plenty of hiding spots helps reduce any minor aggression when keeping a mixed group.

Feeding frequency

Twice daily

Feeding them once or twice a day is recommended, preferably during the evening or shortly after the lights are turned off to match their nocturnal habits. Ensure that food reaches the bottom of the tank so that other tank mates do not consume it all before the catfish can feed. Only feed an amount they can consume within a few minutes to prevent water fouling.

Bioload

Medium to High

Callichthys callichthys is a relatively large catfish (up to 20 cm) and can generate a moderate-to-high biological load, especially when kept in their preferred social groups. Efficient filtration, ideally with a canister or high-power hang-on-back filter, is necessary to handle the organic waste. Regular weekly water changes of 20-30% are recommended to keep nitrate levels low and maintain optimal water health.

Flow

Stagnant

Callichthys callichthys prefers weak to moderate water flow, reflecting their natural habitats in slow-moving or stagnant waters like pools, marshes, and swamps. While they are highly adaptable and can tolerate some water movement, strong currents should be avoided as they can cause stress. Providing calm areas with plenty of plants and caves is ideal.

Jump risk

Yes

There is a high risk of jumping with this species, especially since they naturally attempt to migrate over land when their habitats dry up in the wild. A tight-fitting lid or cover slides without any gaps are absolutely essential to prevent them from escaping. They can easily squeeze through small openings, so all cord outlets should be secured.

Reproduction

Oviparous

Breeding this species is moderately challenging but highly fascinating as they are bubble-nest builders. The male builds a nest using air bubbles, saliva, and floating plant matter, then courts the female to deposit eggs underneath. Once spawning is complete, the male aggressively guards the nest, and it is best to remove the female and other fish to protect them from his territorial behavior.

Compatibility & tankmates

They are excellent candidates for medium-to-large community aquariums, coexisting peacefully with other robust, non-aggressive species. Suitable tank mates include medium-sized characins, cichlids, loricariid catfish, and other peaceful bottom-dwellers. They should not be kept with very tiny fish or shrimp that could easily fit into their mouths, nor with highly aggressive species that might nip their fins.

Tank level

Middle/Bottom

Callichthys callichthys is primarily a bottom-dwelling species that spends most of its time scavenging the substrate for food. However, they are obligate air-breathers and will occasionally dart to the surface to gulp atmospheric air. Adequate open space at the substrate level and a clear path to the surface are important for their natural behavior.