Can bristlenose plecos live with crayfish?

Verdict
Yes

Yes. Bristlenose plecos and crayfish make a good pair. Both are fine at 73–77°F. Plan on at least 30 gal.

Bristlenose plecoBristlenose pleco73–81°F · pH 6.5–7.5 CrayfishCrayfish65–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–77°Bristlenose pleco 73–81°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Bristlenose pleco 6.5–7.5Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Bristlenose pleco · 5 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

Bristlenose plecoCrayfish
Temperature73–81 °F65–77 °F
pH6.5–7.56.5–8
Adult size5.0 in5.0 in
Minimum tank30 gal20 gal
TemperamentPeacefulAggressive
Swims atBottomBottom
GroupAlone or in pairsOne per tank
DietHerbivoreOmnivore

Better tank mates for bristlenose plecos

All bristlenose pleco tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can bristlenose plecos live with crayfish?

Yes. Bristlenose plecos and crayfish make a good pair. Both are fine at 73–77°F. Plan on at least 30 gal.

What temperature suits both bristlenose plecos and crayfish?

73–77 °F. Bristlenose plecos need 73–81 °F, crayfish need 65–77 °F.

What size tank do bristlenose plecos and crayfish need together?

At least 30 gal, set by the bristlenose pleco. Add space for each extra fish.