What fish can live with Black ruby barb?

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 Black ruby barb against your own reading before you buy.

What tank mates should you avoid with Black ruby barb?

Avoid African Cichlid, Oscar, Green Terror based on size, temperament, or predation risk on file.

What size tank do Black ruby barb need for a community?

100L is the planning floor for adult swimming space and bioload headroom. Long-term, a 122L+ 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.

Black ruby barb tank mates

Males develop deep red-and-black colouring during display, especially near spawning. A school of eight in a planted tank produces constant visual competition and colour.

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 Black ruby barb profile·Compatibility checker·Tank builder·More barb

Best tank mates (on file)

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

Corydoras Catfish Pair check
The Black ruby barb profile lists Corydoras Catfish as both safe and a recommended pairing. Corydoras Catfish schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Dwarf Gourami Pair check
The Black ruby barb profile lists Dwarf Gourami as both safe and a recommended pairing. Dwarf Gourami is a peaceful beginner-care species with a 60L minimum. Run the pair checker for your specific tank before stocking.
Ember Tetra Pair check
The Black ruby barb profile lists Ember Tetra as both safe and a recommended pairing. Ember Tetra schools in groups of 8 or more, so plan room for the whole group rather than one fish.
Harlequin Rasbora Pair check
The Black ruby barb profile lists Harlequin Rasbora as a recommended pairing. Harlequin Rasbora schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Neon Tetra Pair check
The Black ruby barb profile lists Neon Tetra as both safe and a recommended pairing. Neon Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish.

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.

Tiger Barb Open pair check
Tiger Barb is flagged as a fin-nipper and Black ruby barb carries the long-finned risk profile (veil tails, trailing fins). Expect torn fins within days unless the nipper is in a proper group and the long-finned fish has plenty of cover. Tiger Barb is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Black ruby barb. Run the pair checker before stocking.
Angelfish Open pair check
Angelfish reaches 20cm and is flagged predatory or as likely to eat small fish. Adult-size Black ruby barb at 6cm is inside that gape range. Both species defend territory. The pairing needs a long footprint and rockwork or planting that breaks the sightline between two defended spots. Angelfish is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Black ruby barb. Run the pair checker before stocking.
German Blue Ram 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. Temperature ranges barely overlap between the two, so one species ends up living at the edge of its comfort window. Run the pair checker before stocking.
Jack Dempsey Open pair check
Jack Dempsey reaches 25cm and is flagged predatory or as likely to eat small fish. Adult-size Black ruby barb at 6cm is inside that gape range. Both species defend territory. The pairing needs a long footprint and rockwork or planting that breaks the sightline between two defended spots. Jack Dempsey is rated aggressive, so expect chasing, fin damage, or display behaviour directed at Black ruby barb. Run the pair checker before stocking.

Fish to avoid with Black ruby barb

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

African Cichlid See why (pair)
African Cichlid reaches 15cm and is flagged predatory. Black ruby barb at 6cm is prey-sized for it. African Cichlid is rated aggressive and Black ruby barb is rated peaceful. No community-style planning carries that gap.
Oscar See why (pair)
Oscar reaches 35cm and is flagged predatory. Black ruby barb at 6cm is prey-sized for it. Oscar needs at least 300L, far above the 100L minimum for Black ruby barb. The tank that houses one stresses the other. Oscar is rated aggressive and Black ruby barb is rated peaceful. No community-style planning carries that gap.
Green Terror See why (pair)
Green Terror reaches 30cm and is flagged predatory. Black ruby barb at 6cm is prey-sized for it. Green Terror needs at least 300L, far above the 100L minimum for Black ruby barb. The tank that houses one stresses the other. Green Terror is rated aggressive and Black ruby barb is rated peaceful. No community-style planning carries that gap.

Tank size and groups

Published minimum for Black ruby barb: 100L — group minimum 6 (schooling).
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: 100L 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 100L minimum tank for Black ruby barb needs a filter rated for at least 400L/hr turnover and a heater maintaining 22–26°C.

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