Can bettas live with chili rasboras?

Verdict
Yes

Yes. Bettas and chili rasboras make a good pair. Both are fine at 76–82°F. Plan on at least 5 gal.

BettaBetta76–82°F · pH 6.5–7.5 Chili rasboraChili rasbora75–82°F · pH 4–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–82°Betta 76–82°Chili rasbora 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7Betta 6.5–7.5Chili rasbora 4–7
The green band is the pH both tolerate.

Size to scale

Betta · 2.5 inChili rasbora · 0.8 in0"1"2"3"4"5"6"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

BettaChili rasbora
Temperature76–82 °F75–82 °F
pH6.5–7.54–7
Adult size2.5 in0.8 in
Minimum tank5 gal5 gal
TemperamentSemi-aggressivePeaceful
Swims atTopMiddle
GroupOne per tankGroups of 8+
DietCarnivoreCarnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for chili rasboras

All chili rasbora tank mates

Questions

Can bettas live with chili rasboras?

Yes. Bettas and chili rasboras make a good pair. Both are fine at 76–82°F. Plan on at least 5 gal.

What temperature suits both bettas and chili rasboras?

76–82 °F. Bettas need 76–82 °F, chili rasboras need 75–82 °F.

What size tank do bettas and chili rasboras need together?

At least 5 gal, set by the betta. Add space for each extra fish.