Eastern Rainbowfish tank mates
Melanotaenia splendida
5 rated pairings from the Eastern Rainbowfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Eastern Rainbowfish needs at least 30 gallons on its own; every companion adds to that.
Excellent matches
3 · Same water, complementary zones, no conflict.
Emerald Dwarf Rasbora
Danio erythromicron
10 gal min · 1" adult · Peaceful
Similar size, peaceful temperament, and mid-water swimming habits make them ideal companions
Rummy Nose Tetra
Hemigrammus rhodostomus
15 gal min · 2" adult · Peaceful
Comparable water requirements and peaceful schooling behavior; both thrive in groups
Bristlenose Pleco
Ancistrus sp.
20 gal min · 5" adult · Peaceful
Nocturnal algae-eater that doesn't compete for food or space in the mid-water zone
Good matches
2 · Compatible with normal care — watch space and numbers.Dwarf Gourami
Trichogaster lalius
15 gal min · 3.5" adult · Semi-aggressive
Peaceful mid-water dweller with similar temperature preferences; monitor for any territorial behavior
Red Cherry Shrimp
Neocaridina davidi
5 gal min · 1.2" adult · Peaceful
Small invertebrates that occupy different ecological niches; ensure adequate hiding spots for shrimp
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.