Can crayfish live with boesemani rainbowfish?

Verdict
Yes

Yes. Crayfish and boesemani rainbowfish make a good pair. Both are fine at 75–77°F. Plan on at least 30 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

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

Size to scale

Crayfish · 5 inBoesemani rainbowfish · 4 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

CrayfishBoesemani rainbowfish
Temperature65–77 °F75–82 °F
pH6.5–87–8
Adult size5.0 in4.0 in
Minimum tank20 gal30 gal
TemperamentAggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 6+
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can crayfish live with boesemani rainbowfish?

Yes. Crayfish and boesemani rainbowfish make a good pair. Both are fine at 75–77°F. Plan on at least 30 gal.

What temperature suits both crayfish and boesemani rainbowfish?

75–77 °F. Crayfish need 65–77 °F, boesemani rainbowfish need 75–82 °F.

What size tank do crayfish and boesemani rainbowfish need together?

At least 30 gal, set by the boesemani rainbowfish. Add space for each extra fish.