Can crayfish live with firemouth cichlids?

Verdict
Yes

Yes. Crayfish and firemouth cichlids get along in the same tank. Both are fine at 75–77°F. Plan on at least 30 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–77°Crayfish 65–77°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 6.5–8Crayfish 6.5–8Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inFiremouth cichlid · 6 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

CrayfishFiremouth cichlid
Temperature65–77 °F75–86 °F
pH6.5–86.5–8
Adult size5.0 in6.0 in
Minimum tank20 gal30 gal
TemperamentAggressiveSemi-aggressive
Swims atBottomBottom
GroupOne per tankAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can crayfish live with firemouth cichlids?

Yes. Crayfish and firemouth cichlids get along in the same tank. Both are fine at 75–77°F. Plan on at least 30 gal.

What temperature suits both crayfish and firemouth cichlids?

75–77 °F. Crayfish need 65–77 °F, firemouth cichlids need 75–86 °F.

What size tank do crayfish and firemouth cichlids need together?

At least 30 gal, set by the firemouth cichlid. Add space for each extra fish.