Can corydoras live with hillstream loaches?

Verdict
Yes

Yes. Corydoras and hillstream loaches get along in the same tank. Both are fine at 72–75°F. Plan on at least 20 gal.

CorydorasCorydoras72–79°F · pH 6–7.8 Hillstream loachHillstream loach68–75°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–75°Corydoras 72–79°Hillstream loach 68–75°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Corydoras 6–7.8Hillstream loach 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inHillstream loach · 2.5 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

CorydorasHillstream loach
Temperature72–79 °F68–75 °F
pH6–7.86.5–7.5
Adult size2.5 in2.5 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupGroups of 6+Groups of 3+
DietOmnivoreHerbivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for hillstream loaches

All hillstream loach tank mates

Questions

Can corydoras live with hillstream loaches?

Yes. Corydoras and hillstream loaches get along in the same tank. Both are fine at 72–75°F. Plan on at least 20 gal.

What temperature suits both corydoras and hillstream loaches?

72–75 °F. Corydoras need 72–79 °F, hillstream loaches need 68–75 °F.

What size tank do corydoras and hillstream loaches need together?

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