Can crayfish live with chili rasboras?

Verdict
Yes

Yes. Crayfish and chili rasboras make a good pair. Both are fine at 75–77°F. Plan on at least 20 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Chili rasboraChili rasbora75–82°F · pH 4–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–77°Crayfish 65–77°Chili rasbora 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7Crayfish 6.5–8Chili rasbora 4–7
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 inChili rasbora · 0.8 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

CrayfishChili rasbora
Temperature65–77 °F75–82 °F
pH6.5–84–7
Adult size5.0 in0.8 in
Minimum tank20 gal5 gal
TemperamentAggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 8+
DietOmnivoreCarnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for chili rasboras

All chili rasbora tank mates

Questions

Can crayfish live with chili rasboras?

Yes. Crayfish and chili rasboras make a good pair. Both are fine at 75–77°F. Plan on at least 20 gal.

What temperature suits both crayfish and chili rasboras?

75–77 °F. Crayfish need 65–77 °F, chili rasboras need 75–82 °F.

What size tank do crayfish and chili rasboras need together?

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