Forktail Rainbowfish tank mates
Pseudomugil furcatus
6 rated pairings from the Forktail Rainbowfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Forktail Rainbowfish needs at least 10 gallons on its own; every companion adds to that.
Excellent matches
4 · Same water, complementary zones, no conflict.
Emerald Dwarf Rasbora
Danio erythromicron
10 gal min · 1" adult · Peaceful
Similar size, peaceful temperament, and identical water parameter requirements make them ideal companions
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful algae eaters that occupy the bottom zone and share the same gentle water conditions
Dwarf Hairgrass
Eleocharis parvula
Foreground plant that provides shelter and spawning sites while creating the planted nano tank aesthetic
Anubias Nana
Anubias barteri var. nana
Hardy plant that provides cover and resting areas without requiring high light or CO2
Good matches
2 · Compatible with normal care — watch space and numbers.
Red Cherry Shrimp
Neocaridina davidi
5 gal min · 1.2" adult · Peaceful
Small shrimp are generally safe; provide dense plants for shrimp to retreat and avoid fry predation
Celestial Pearl Danio
Danio margaritatus
10 gal min · 1" adult · Peaceful
Similar size and peaceful nature; both prefer planted tanks, though slightly different temperature optima
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.