Can bettas live with dwarf neon rainbowfish?

Verdict
Yes

Yes, bettas and dwarf neon rainbowfish can live together. Both are fine at 76–82°F. Plan on at least 20 gal.

BettaBetta76–82°F · pH 6.5–7.5 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

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

Size to scale

Betta · 2.5 inDwarf neon rainbowfish · 2.5 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

BettaDwarf neon rainbowfish
Temperature76–82 °F75–82 °F
pH6.5–7.56.5–7.5
Adult size2.5 in2.5 in
Minimum tank5 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atTopMiddle
GroupOne per tankGroups of 6+
DietCarnivoreOmnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can bettas live with dwarf neon rainbowfish?

Yes, bettas and dwarf neon rainbowfish can live together. Both are fine at 76–82°F. Plan on at least 20 gal.

What temperature suits both bettas and dwarf neon rainbowfish?

76–82 °F. Bettas need 76–82 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do bettas and dwarf neon rainbowfish need together?

At least 20 gal, set by the dwarf neon rainbowfish. Add space for each extra fish.