Can neon tetras live with crayfish?

Verdict
Yes

Yes. Neon tetras and crayfish get along in the same tank. Both are fine at 72–77°F. Plan on at least 20 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 CrayfishCrayfish65–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Neon tetra 72–79°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7Neon tetra 6–7Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Neon tetra · 1.5 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

Neon tetraCrayfish
Temperature72–79 °F65–77 °F
pH6–76.5–8
Adult size1.5 in5.0 in
Minimum tank10 gal20 gal
TemperamentPeacefulAggressive
Swims atMiddleBottom
GroupGroups of 6+One per tank
DietOmnivoreOmnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can neon tetras live with crayfish?

Yes. Neon tetras and crayfish get along in the same tank. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both neon tetras and crayfish?

72–77 °F. Neon tetras need 72–79 °F, crayfish need 65–77 °F.

What size tank do neon tetras and crayfish need together?

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