Can crayfish live with dwarf gouramis?

Verdict
Yes

Yes. Crayfish and dwarf gouramis make a good pair. Both are fine at 72–77°F. Plan on at least 20 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Dwarf gouramiDwarf gourami72–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Crayfish 65–77°Dwarf gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Crayfish 6.5–8Dwarf gourami 6–7.5
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inDwarf gourami · 3 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

CrayfishDwarf gourami
Temperature65–77 °F72–82 °F
pH6.5–86–7.5
Adult size5.0 in3.0 in
Minimum tank20 gal10 gal
TemperamentAggressivePeaceful
Swims atBottomTop
GroupOne per tankAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for dwarf gouramis

All dwarf gourami tank mates

Questions

Can crayfish live with dwarf gouramis?

Yes. Crayfish and dwarf gouramis make a good pair. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both crayfish and dwarf gouramis?

72–77 °F. Crayfish need 65–77 °F, dwarf gouramis need 72–82 °F.

What size tank do crayfish and dwarf gouramis need together?

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