Can corydoras live with crayfish?

Verdict
Yes

Yes. Corydoras and crayfish make a good pair. Both are fine at 72–77°F. Plan on at least 20 gal.

CorydorasCorydoras72–79°F · pH 6–7.8 CrayfishCrayfish65–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Corydoras 72–79°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.8Corydoras 6–7.8Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inCrayfish · 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

CorydorasCrayfish
Temperature72–79 °F65–77 °F
pH6–7.86.5–8
Adult size2.5 in5.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulAggressive
Swims atBottomBottom
GroupGroups of 6+One per tank
DietOmnivoreOmnivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can corydoras live with crayfish?

Yes. Corydoras and crayfish make a good pair. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both corydoras and crayfish?

72–77 °F. Corydoras need 72–79 °F, crayfish need 65–77 °F.

What size tank do corydoras and crayfish need together?

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