Can bettas live with neon tetras?

Verdict
Yes

Yes. Bettas and neon tetras get along in the same tank. Both are fine at 76–79°F. Plan on at least 10 gal.

BettaBetta76–82°F · pH 6.5–7.5 Neon tetraNeon tetra72–79°F · pH 6–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–79°Betta 76–82°Neon tetra 72–79°
The green band is the temperature range both can live in.
456789Both: 6.5–7Betta 6.5–7.5Neon tetra 6–7
The green band is the pH both tolerate.

Size to scale

Betta · 2.5 inNeon tetra · 1.5 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

BettaNeon tetra
Temperature76–82 °F72–79 °F
pH6.5–7.56–7
Adult size2.5 in1.5 in
Minimum tank5 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atTopMiddle
GroupOne per tankGroups of 6+
DietCarnivoreOmnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for neon tetras

All neon tetra tank mates

Questions

Can bettas live with neon tetras?

Yes. Bettas and neon tetras get along in the same tank. Both are fine at 76–79°F. Plan on at least 10 gal.

What temperature suits both bettas and neon tetras?

76–79 °F. Bettas need 76–82 °F, neon tetras need 72–79 °F.

What size tank do bettas and neon tetras need together?

At least 10 gal, set by the neon tetra. Add space for each extra fish.