Limit: no more than 1 per tank. Keep singly (FKW: >1 only in 100+ gal); aggressive to lookalikes.
Check a tank with Rainbow shark
Good tank mates for Rainbow shark
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.
African butterflyfish · Angelfish · Banjo catfish · Betta (male) · Black skirt tetra · Blue acara · Bolivian ram · Bristlenose pleco · Buenos Aires tetra · Bumblebee goby · Clown pleco · Congo tetra · Dwarf gourami · Flying fox · Gardneri killifish · Indian glassfish · Jewel cichlid · Kribensis · Kuhli loach · Molly · Pea puffer · Pearl gourami · Pictus catfish · Red rainbowfish
Avoid with Rainbow shark
Boeseman's rainbowfish (temperature) · Common / comet goldfish (temperature) · Discus (temperature) · Dojo loach (temperature) · Fancy goldfish (temperature) · German blue ram (temperature) · Gold barb (temperature) · Medaka (temperature) · Paradise fish (temperature) · Rosy barb (temperature) · White cloud mountain minnow (temperature)
Sources
Checked 2026-11-09 · confidence: high. These are cautious community guidelines, not guarantees. Not veterinary advice. Report an error.