Corydoras spp.

Corydoras Catfish

Corydoras are gentle, sociable bottom-feeders that do best in same-species groups over soft sand. They are one of the easiest community fish to keep well.

CallichthyidaeLifespan 5–10 years, sometimes longerCare complexity 2/5Suitable for beginners

Corydoras Catfish in a suitable home habitat

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At a glance

Scientific name: Corydoras spp.
Family: Callichthyidae
Origin: Rivers and streams of South America
Lifespan: 5–10 years, sometimes longer
Adult size: 2.5–7 cm depending on species
Weight: Not typically measured
Temperament: Peaceful, gregarious bottom-dweller
Activity level: Moderate; constant gentle foraging along the substrate
Social needs: High — keep in groups of six or more of the same species
Intelligence: Simple but shows clear shoaling coordination and learned feeding spots
Noise: Silent

Housing and environment

Housing: Minimum 80 litre tank with fine sand substrate to protect their barbels
Space requirement: Floor area matters more than height; avoid sharp gravel
Temperature: 22–26°C
Humidity: Not applicable
Exercise: Provided by tank floor space for foraging
Grooming: Not applicable; sensitive barbels need soft, sand-based substrate

Life stages and changing needs

Expanded care guidance · Updated 7 October 2026 · Not professionally reviewed

Young animals and settling in

Juvenile bottom-dwelling catfish need a fully cycled aquarium with fine, smooth substrate that will not damage their sensitive barbels, since barbel erosion from sharp gravel or poor water quality is a common and often overlooked welfare problem. Social needs differ within this group: shoaling corydoras should not be kept singly or in pairs, whereas bristlenose plecos are usually kept singly or with only one male per tank, so follow the social guidance in this profile.

Adult care and reproductive changes

Adults need the social arrangement described in this profile and ample floor space with driftwood or smooth decor to forage around, since these catfish spend most of their time at the substrate level rather than mid-water. Breeding can occur in a well-established community but egg and fry survival is low without separate specialist rearing; do not expect every clutch to be a realistic breeding opportunity. Overcrowding at the aquarium floor can cause competition for food that is easy to miss when only watching the mid-water fish.

Later life and changing needs

There is no fixed senior age for these fish; condition, barbel appearance, swimming control and feeding response are better guides than time alone. A previously active bottom-dweller becoming reclusive, thin or developing clamped fins needs water testing and assessment rather than being assumed to be simply resting more with age, since this behaviour often indicates deteriorating water quality or illness.

Diet and feeding

Sinking pellets and wafers plus occasional live or frozen bloodworm

These catfish are not simply tank cleaners living on algae and leftover flake; they need their own sinking wafers or tablets formulated for bottom feeders, offered after lights-out or away from faster surface-feeding fish that would otherwise eat the ration first. Occasional blanched vegetables and suitable sinking protein foods add valuable variety, but a diet based solely on whatever drifts to the substrate from other fish is inadequate and will lead to gradual decline.

Watch that barbels and mouths are not being outcompeted by boisterous tank mates at feeding time, since a seemingly well-stocked community can still leave bottom-dwellers underfed if food never reaches the floor. Offer food in multiple locations across the substrate if several bottom-dwellers share the tank, and observe each individual rather than judging feeding success from general activity at the surface.

Daily care and ongoing checks

Every day

Check filter flow, water clarity and substrate condition daily, since these catfish are particularly sensitive to poor water quality and will often show barbel damage or clamped fins before more obvious symptoms appear in other tank residents. Offer a sinking food portion suited to the number of fish, and observe that each fish is active and feeding rather than hiding constantly, which can indicate stress or unsuitable tank mates.

Regular maintenance and prevention

Maintain a consistent water-change schedule based on test results and stocking density, rather than assuming bottom-dwellers are hardier and need less frequent maintenance than other fish. Inspect decor and substrate for sharp edges that could injure barbels, and provide adequate hiding spaces such as caves or wood, since bottom-dwellers still need the option to retreat from boisterous companions.

Behaviour and compatibility

Group foraging, occasional dashes to the surface to gulp air, resting in huddles

With children: Calm, easy fish for children to watch feed
With other animals: Peaceful with almost all community fish
Training difficulty: Not applicable

Health

Barbel erosion from coarse substrate
Ich
Bacterial infections from poor water quality
Bloat

No dedicated vet services; prevention through stable water parameters is key

Special care requirements

Never house on sharp gravel, which damages their sensitive barbels over time

Shoaling needs and substrate quality

Corydoras are shoaling catfish and should never be kept singly or in pairs; a group of several individuals supports natural foraging and reduces stress-related hiding. Fine, soft substrate is essential, since sharp gravel can erode their sensitive barbels over time, a common and often overlooked welfare problem.

Offer sinking food specifically for this species rather than relying on scraps that drift down from other fish, which can leave the shoal underfed even in a well-stocked tank. Barbel damage, clamped fins or visible sores need prompt water testing and an aquatic-vet consultation.

Before you take one on

Sources and further guidance

These welfare and veterinary resources inform general husbandry advice; they do not certify this profile or replace a species-experienced professional. Confirm exact environmental settings and feeding plans for your animal.

RSPCA: caring for pet fish

Can your home meet corydoras catfish needs?

Plan for a lifespan of 5–10 years, sometimes longer, including holiday cover and, where one is available, a vet familiar with this species. Lifespan ranges are not guarantees.
Arrange the social setting before arrival. Social guidance for this species: High — keep in groups of six or more of the same species. Do not assume another animal of any species is a suitable companion.
Habitat priority for this species: Floor area matters more than height; avoid sharp gravel. Make sure your setup can provide this consistently. Check temperature and water quality with a thermometer and test kits rather than guessing.
Key care point: Never house on sharp gravel, which damages their sensitive barbels over time. Discuss diet and any specialist needs with the supplier, rescue and a vet who treats this species, and check local legal requirements before acquiring an animal.

Educational reference, not an individual diagnosis or a verified professional review. Read our editorial policy.

Guidance libraries and further reading

These organisations publish relevant guidance. Their links are further reading, not evidence that they have reviewed this page.

RSPCA — animal care and welfare advice across species
PDSA — veterinary charity pet health advice
AVMA — American Veterinary Medical Association owner resources