Long fins: avoid known fin nippers such as tiger barbs and serpae tetras.
Check a tank with Threadfin rainbowfish
Good tank mates for Threadfin rainbowfish
These species share its temperature range and temperament, with no fin-nipping or predation risk under our rules. Still check your tank size and bioload in the checker.
Agassiz's dwarf cichlid · Amano shrimp · Assassin snail · Banjo catfish · Betta (male) · Black neon tetra · Black phantom tetra · Boeseman's rainbowfish · Bumblebee goby · Cardinal tetra · Cherry barb · Cherry shrimp · Chili rasbora · Clown pleco · Colombian tetra · Dwarf neon rainbowfish · Dwarf pencilfish · Ember tetra · Emperor tetra · Endler's livebearer · Forktail blue-eye · German blue ram · Ghost shrimp · Glowlight tetra
Avoid with Threadfin rainbowfish
African butterflyfish (predation) · Banded archerfish (predation) · Black ghost knifefish (predation) · Blue acara (predation) · Bristlenose pleco (temperature) · Bronze corydoras (temperature) · Checkerboard barb (temperature) · Common / comet goldfish (temperature) · Convict cichlid (predation) · CPO dwarf crayfish (temperature) · Crystal red shrimp (temperature) · Demasoni cichlid (aggression) · Denison barb (temperature) · Dojo loach (temperature) · Emerald dwarf rasbora (temperature) · Fancy goldfish (temperature) · Gardneri killifish (temperature) · Gold barb (temperature)
Sources
Checked 2026-11-09 · confidence: medium. These are cautious community guidelines, not guarantees. Not veterinary advice. Report an error.