What fish can live with Betta?

Safest tank mates stay out of the betta's water column: corydoras and kuhli loaches on the bottom, nerite snails and amano shrimp on cleanup. Skip mid-water shoals and any long-finned fish.

What tank mates should you avoid with Betta?

Avoid Tiger Barb, Guppy based on size, temperament, or predation risk on file.

What size tank do Betta need for a community?

25 litres is the minimum for a tank that holds heat, runs a real filter, and has plants. The 5L cubes you see in shops crash temperature overnight and overload on one feeding.

Betta tank mates

Best kept solo. A community betta tank is a coin-flip even with the right tank mates. A 75L+ planted sorority setup is barely better odds.

Evidence: 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 Betta profile·Compatibility checker·Tank builder·More gourami

Best tank mates (on file)

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

Corydoras Catfish Pair check
The Betta 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. Corydoras Catfish swims in the bottom zone while Betta stays in the top, so the two will not crowd the same water column.
Harlequin Rasbora Pair check
The Betta profile lists Harlequin Rasbora as both safe and a recommended pairing. Harlequin Rasbora schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Kuhli Loach Pair check
The Betta profile lists Kuhli Loach as both safe and a recommended pairing. Kuhli Loach schools in groups of 4 or more, so plan room for the whole group rather than one fish. Kuhli Loach swims in the bottom zone while Betta stays in the top, so the two will not crowd the same water column.
Neon Tetra Pair check
The Betta 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.
Otocinclus Pair check
The Betta profile lists Otocinclus as both safe and a recommended pairing. Otocinclus schools in groups of 4 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.

None on file beyond the safe list.

Fish to avoid with Betta

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

Tiger Barb See why (pair)
Tiger Barb needs at least 80L, far above the 20L minimum for Betta. The tank that houses one stresses the other.
Guppy See why (pair)
Guppy conflicts with Betta on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.

Tank size and groups

Published minimum for Betta: 20L — 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: 30L 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 20L minimum tank for Betta needs a filter rated for at least 80L/hr turnover and a heater maintaining 24–30°C.

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

Related (care + temperament)

Ghost Shrimp

Other species that list Betta

Reverse lookup: these profiles reference Betta under safe or “best with” lists.