Can hillstream loaches live with crayfish?

Verdict
Yes

Yes. Hillstream loaches and crayfish make a good pair. Both are fine at 68–75°F. Plan on at least 20 gal.

Hillstream loachHillstream loach68–75°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: 68–75°Hillstream loach 68–75°Crayfish 65–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Hillstream loach 6.5–7.5Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

Hillstream loach · 2.5 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

Hillstream loachCrayfish
Temperature68–75 °F65–77 °F
pH6.5–7.56.5–8
Adult size2.5 in5.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulAggressive
Swims atBottomBottom
GroupGroups of 3+One per tank
DietHerbivoreOmnivore

Better tank mates for hillstream loaches

All hillstream loach tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can hillstream loaches live with crayfish?

Yes. Hillstream loaches and crayfish make a good pair. Both are fine at 68–75°F. Plan on at least 20 gal.

What temperature suits both hillstream loaches and crayfish?

68–75 °F. Hillstream loaches need 68–75 °F, crayfish need 65–77 °F.

What size tank do hillstream loaches and crayfish need together?

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