Red-Tailed Rasbora tank mates
Rasbora borapetensis
5 rated pairings from the Red-Tailed Rasbora care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Red-Tailed Rasbora needs at least 20 gallons on its own; every companion adds to that.
Excellent matches
4 · Same water, complementary zones, no conflict.
Neon Tetra
Paracheirodon innesi
10 gal min · 1.5" adult · Peaceful
Similar size and peaceful temperament, both prefer soft acidic water
Cardinal Tetra
Paracheirodon axelrodi
15 gal min · 2" adult · Peaceful
Compatible water parameters and peaceful schooling behavior
Harlequin Rasbora
Trigonostigma heteromorpha
10 gal min · 2" adult · Peaceful
Same family, similar size and care requirements
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful algae eater that shares similar water parameters
Good matches
1 · Compatible with normal care — watch space and numbers.Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.