Can crayfish live with apistogramma?

Verdict
Yes

Yes. Crayfish and apistogramma make a good pair. Both are fine at 75–77°F. Plan on at least 20 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 ApistogrammaApistogramma75–84°F · pH 5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–77°Crayfish 65–77°Apistogramma 75–84°
The green band is the temperature range both can live in.
456789Both: 6.5–7Crayfish 6.5–8Apistogramma 5–7
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inApistogramma · 3 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

CrayfishApistogramma
Temperature65–77 °F75–84 °F
pH6.5–85–7
Adult size5.0 in3.0 in
Minimum tank20 gal20 gal
TemperamentAggressiveSemi-aggressive
Swims atBottomBottom
GroupOne per tankAlone or in pairs
DietOmnivoreCarnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for apistogramma

All apistogramma tank mates

Questions

Can crayfish live with apistogramma?

Yes. Crayfish and apistogramma make a good pair. Both are fine at 75–77°F. Plan on at least 20 gal.

What temperature suits both crayfish and apistogramma?

75–77 °F. Crayfish need 65–77 °F, apistogramma need 75–84 °F.

What size tank do crayfish and apistogramma need together?

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