Can bettas live with corydoras?

Verdict
Yes

Yes. Bettas and corydoras make a good pair. Both are fine at 76–79°F. Plan on at least 20 gal.

BettaBetta76–82°F · pH 6.5–7.5 CorydorasCorydoras72–79°F · pH 6–7.8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–79°Betta 76–82°Corydoras 72–79°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Betta 6.5–7.5Corydoras 6–7.8
The green band is the pH both tolerate.

Size to scale

Betta · 2.5 inCorydoras · 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

BettaCorydoras
Temperature76–82 °F72–79 °F
pH6.5–7.56–7.8
Adult size2.5 in2.5 in
Minimum tank5 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atTopBottom
GroupOne per tankGroups of 6+
DietCarnivoreOmnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for corydoras

All corydoras tank mates

Questions

Can bettas live with corydoras?

Yes. Bettas and corydoras make a good pair. Both are fine at 76–79°F. Plan on at least 20 gal.

What temperature suits both bettas and corydoras?

76–79 °F. Bettas need 76–82 °F, corydoras need 72–79 °F.

What size tank do bettas and corydoras need together?

At least 20 gal, set by the corydoras. Add space for each extra fish.