What fish can live with Red-tailed catfish?

Use the "Often compatible" lists as a shortlist, not a stocking plan. Always run the pair tool and check the footprint of your actual tank first. Verify behaviour for Red-tailed catfish against your own reading before you buy.

What tank mates should you avoid with Red-tailed catfish?

Avoid Neon Tetra, Guppy, Chili Rasbora, Ember Tetra based on size, temperament, or predation risk on file.

What size tank do Red-tailed catfish need for a community?

2000L is the planning floor for adult swimming space and bioload headroom. Long-term, a 3000L+ tank lets adults use the full footprint without crowding the next species. Footprint, meaning length and front-to-back depth, matters as much as raw volume for active or territorial species.

Red-tailed catfish tank mates

Reaches 120 cm and requires 2000L or more at adult size. Sold as 8 cm juveniles to aquarists who do not understand the commitment.

Evidence: partially verified

Confidence: high

Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.

← Full Red-tailed catfish profile·Compatibility checker·Tank builder·More catfish

Best tank mates (on file)

Merged from conservative safest and best with fields — de-duplicated by species.

Bala / silver shark Pair check
The Red-tailed catfish profile lists Bala / silver shark as both safe and a recommended pairing. Bala / silver shark schools in groups of 5 or more, so plan room for the whole group rather than one fish. Bala / silver shark grows to about 35cm, which is borderline mouth-size for an adult 120cm Red-tailed catfish.
Giant danio Pair check
The Red-tailed catfish profile lists Giant danio as both safe and a recommended pairing. Giant danio schools in groups of 6 or more, so plan room for the whole group rather than one fish. Giant danio grows to about 11cm, which is borderline mouth-size for an adult 120cm Red-tailed catfish.
Oscar Pair check
The Red-tailed catfish profile lists Oscar as both safe and a recommended pairing. Oscar grows to about 35cm, which is borderline mouth-size for an adult 120cm Red-tailed catfish.
Tinfoil barb Pair check
The Red-tailed catfish profile lists Tinfoil barb as both safe and a recommended pairing. Tinfoil barb schools in groups of 5 or more, so plan room for the whole group rather than one fish. Tinfoil barb grows to about 35cm, which is borderline mouth-size for an adult 120cm Red-tailed catfish.

Risky or situational

From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.

Boesemani Rainbowfish Open pair check
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Corydoras Catfish Open pair check
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Dwarf Gourami Open pair check
Both species defend territory. The pairing needs a long footprint and rockwork or planting that breaks the sightline between two defended spots. Run the pair checker before stocking.

Fish to avoid with Red-tailed catfish

From the unsafe list — predation, aggression, or space rules on this profile.

Neon Tetra See why (pair)
Red-tailed catfish is flagged as predatory or as likely to eat small fish, and Neon Tetra at 4cm is well within an adult Red-tailed catfish's gape.
Guppy See why (pair)
Red-tailed catfish is flagged as predatory or as likely to eat small fish, and Guppy at 5cm is well within an adult Red-tailed catfish's gape.
Chili Rasbora See why (pair)
Red-tailed catfish is flagged as predatory or as likely to eat small fish, and Chili Rasbora at 2cm is well within an adult Red-tailed catfish's gape.
Ember Tetra See why (pair)
Red-tailed catfish is flagged as predatory or as likely to eat small fish, and Ember Tetra at 2cm is well within an adult Red-tailed catfish's gape.

Tank size and groups

Published minimum for Red-tailed catfish: 2000L — group minimum 1 .
Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other — that is why pair checks include tank context, not only temperament.
Nearest litre hub to this minimum: 300L hub.

Easier alternatives to consider

Conservative beginner-peaceful picks from the library — not replacements for reading, but a shorter on-ramp than this species for a first tank.

Plan before you buy

Pair checks for every mix, then multi-species stocking in the builder.

Open compatibility checker Tank builder

Filtration & heating

A 2000L minimum tank for Red-tailed catfish needs a filter rated for at least 8000L/hr turnover and a heater maintaining 24–28°C.

Filter buying guide →Heater buying guide →Beginner plants guide →