Can goldfish live with crayfish?

Verdict
Yes

Yes. Goldfish and crayfish make a good pair. Both are fine at 65–74°F. Plan on at least 40 gal.

GoldfishGoldfish60–74°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: 65–74°Goldfish 60–74°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 7–8Goldfish 7–8Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Goldfish · 10 inCrayfish · 5 in0"2"4"6"8"10"
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

GoldfishCrayfish
Temperature60–74 °F65–77 °F
pH7–86.5–8
Adult size10.0 in5.0 in
Minimum tank40 gal20 gal
TemperamentPeacefulAggressive
Swims atAll levelsBottom
GroupAlone or in pairsOne per tank
DietOmnivoreOmnivore

Better tank mates for goldfish

All goldfish tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can goldfish live with crayfish?

Yes. Goldfish and crayfish make a good pair. Both are fine at 65–74°F. Plan on at least 40 gal.

What temperature suits both goldfish and crayfish?

65–74 °F. Goldfish need 60–74 °F, crayfish need 65–77 °F.

What size tank do goldfish and crayfish need together?

At least 40 gal, set by the goldfish. Add space for each extra fish.