Can rainbow sharks live with crayfish?

Verdict
Yes

Yes. Rainbow sharks and crayfish make a good pair. Both are fine at 72–77°F. Plan on at least 55 gal.

Rainbow sharkRainbow shark72–80°F · pH 6.5–7.5 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°Rainbow shark 72–80°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Rainbow shark 6.5–7.5Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Rainbow shark · 6 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

Rainbow sharkCrayfish
Temperature72–80 °F65–77 °F
pH6.5–7.56.5–8
Adult size6.0 in5.0 in
Minimum tank55 gal20 gal
TemperamentSemi-aggressiveAggressive
Swims atBottomBottom
GroupOne per tankOne per tank
DietOmnivoreOmnivore

Better tank mates for rainbow sharks

All rainbow shark tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can rainbow sharks live with crayfish?

Yes. Rainbow sharks and crayfish make a good pair. Both are fine at 72–77°F. Plan on at least 55 gal.

What temperature suits both rainbow sharks and crayfish?

72–77 °F. Rainbow sharks need 72–80 °F, crayfish need 65–77 °F.

What size tank do rainbow sharks and crayfish need together?

At least 55 gal, set by the rainbow shark. Add space for each extra fish.