Can crayfish live with electric blue acaras?

Verdict
Yes

Yes. Crayfish and electric blue acaras get along in the same tank. Both are fine at 72–77°F. Plan on at least 30 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Electric blue acaraElectric blue acara72–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Crayfish 65–77°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Crayfish 6.5–8Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inElectric blue acara · 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

CrayfishElectric blue acara
Temperature65–77 °F72–82 °F
pH6.5–86.5–7.5
Adult size5.0 in6.0 in
Minimum tank20 gal30 gal
TemperamentAggressiveSemi-aggressive
Swims atBottomMiddle
GroupOne per tankAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can crayfish live with electric blue acaras?

Yes. Crayfish and electric blue acaras get along in the same tank. Both are fine at 72–77°F. Plan on at least 30 gal.

What temperature suits both crayfish and electric blue acaras?

72–77 °F. Crayfish need 65–77 °F, electric blue acaras need 72–82 °F.

What size tank do crayfish and electric blue acaras need together?

At least 30 gal, set by the electric blue acara. Add space for each extra fish.