Australian Rainbowfish tank mates
Melanotaenia fluviatilis
5 rated pairings from the Australian Rainbowfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Australian Rainbowfish needs at least 30 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.
Rummy Nose Tetra
Hemigrammus rhodostomus
15 gal min · 2" adult · Peaceful
Similar size, peaceful temperament, and compatible water parameters make them ideal mid-water companions
Sterbai Corydoras
Corydoras sterbai
20 gal min · 2.5" adult · Peaceful
Bottom-dwelling scavenger that occupies different water zone and shares peaceful nature; compatible temperature range
Good matches
2 · Compatible with normal care — watch space and numbers.
Harlequin Rasbora
Trigonostigma heteromorpha
10 gal min · 2" adult · Peaceful
Small, peaceful schooling fish with similar water requirements; may be slightly smaller but compatible
Bristlenose Pleco
Ancistrus sp.
20 gal min · 5" adult · Peaceful
Peaceful algae eater that occupies bottom zone; prefers slightly cooler temps but range overlaps adequately
Use caution
1 · Works in the right setup; read the note before combining.
Also recommended alongside Australian Rainbowfish
Species whose own guides list Australian Rainbowfish as a tank mate.
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.