Can crayfish live with paradise fish?

Verdict
Yes

Yes, crayfish and paradise fish can live together. Both are fine at 65–77°F. Plan on at least 20 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Paradise fishParadise fish61–79°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 65–77°Crayfish 65–77°Paradise fish 61–79°
The green band is the temperature range both can live in.
456789Both: 6.5–8Crayfish 6.5–8Paradise fish 6–8
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inParadise fish · 3.5 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

CrayfishParadise fish
Temperature65–77 °F61–79 °F
pH6.5–86–8
Adult size5.0 in3.5 in
Minimum tank20 gal20 gal
TemperamentAggressiveSemi-aggressive
Swims atBottomTop
GroupOne per tankOne per tank
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for paradise fish

All paradise fish tank mates

Questions

Can crayfish live with paradise fish?

Yes, crayfish and paradise fish can live together. Both are fine at 65–77°F. Plan on at least 20 gal.

What temperature suits both crayfish and paradise fish?

65–77 °F. Crayfish need 65–77 °F, paradise fish need 61–79 °F.

What size tank do crayfish and paradise fish need together?

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