Can crayfish live with pygmy corys?

Verdict
Yes

Yes, crayfish and pygmy corys can live together. Both are fine at 72–77°F. Plan on at least 20 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Pygmy coryPygmy cory72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Crayfish 65–77°Pygmy cory 72–79°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Crayfish 6.5–8Pygmy cory 6–7.5
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inPygmy cory · 1 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

CrayfishPygmy cory
Temperature65–77 °F72–79 °F
pH6.5–86–7.5
Adult size5.0 in1.0 in
Minimum tank20 gal10 gal
TemperamentAggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 6+
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for pygmy corys

All pygmy cory tank mates

Questions

Can crayfish live with pygmy corys?

Yes, crayfish and pygmy corys can live together. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both crayfish and pygmy corys?

72–77 °F. Crayfish need 65–77 °F, pygmy corys need 72–79 °F.

What size tank do crayfish and pygmy corys need together?

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