Delta Betta tank mates
Betta splendens
4 rated pairings from the Delta Betta care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Delta Betta needs at least 5 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.
Good matches
2 · Compatible with normal care — watch space and numbers.
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful bottom-dweller that won't compete for food or space; avoid fin-nipping species
Emerald Dwarf Rasbora
Danio erythromicron
10 gal min · 1" adult · Peaceful
Small, peaceful schooling fish that occupy mid-water; keep in groups of 6+ to reduce stress
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.