Can discus live with crayfish?

Verdict
No

No. Discus and crayfish should not share a tank. No shared temperature. Discus need 82–88°F, crayfish need 65–77°F.

DiscusDiscus82–88°F · pH 5.5–7 CrayfishCrayfish65–77°F · pH 6.5–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Discus 82–88°Crayfish 65–77°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 6.5–7Discus 5.5–7Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Discus · 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

DiscusCrayfish
Temperature82–88 °F65–77 °F
pH5.5–76.5–8
Adult size6.0 in5.0 in
Minimum tank55 gal20 gal
TemperamentPeacefulAggressive
Swims atMiddleBottom
GroupGroups of 5+One per tank
DietCarnivoreOmnivore

Better tank mates for discus

All discus tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can discus live with crayfish?

No. Discus and crayfish should not share a tank. No shared temperature. Discus need 82–88°F, crayfish need 65–77°F.

What temperature suits both discus and crayfish?

None. Discus need 82–88 °F and crayfish need 65–77 °F, so the ranges do not meet.

What size tank do discus and crayfish need together?

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