Can pea puffers live with crayfish?

Verdict
Yes

Yes. Pea puffers and crayfish make a good pair. Both are fine at 74–77°F. Plan on at least 20 gal.

Pea pufferPea puffer74–82°F · pH 7–8 CrayfishCrayfish65–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–77°Pea puffer 74–82°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 7–8Pea puffer 7–8Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Pea puffer · 1 inCrayfish · 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

Pea pufferCrayfish
Temperature74–82 °F65–77 °F
pH7–86.5–8
Adult size1.0 in5.0 in
Minimum tank5 gal20 gal
TemperamentAggressiveAggressive
Swims atAll levelsBottom
GroupAlone or in pairsOne per tank
DietCarnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Questions

Can pea puffers live with crayfish?

Yes. Pea puffers and crayfish make a good pair. Both are fine at 74–77°F. Plan on at least 20 gal.

What temperature suits both pea puffers and crayfish?

74–77 °F. Pea puffers need 74–82 °F, crayfish need 65–77 °F.

What size tank do pea puffers and crayfish need together?

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