Can corydoras live with hatchetfish?

Verdict
Yes

Yes. Corydoras and hatchetfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 20 gal.

CorydorasCorydoras72–79°F · pH 6–7.8 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Corydoras 72–79°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 6–7.5Corydoras 6–7.8Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inHatchetfish · 1.5 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

CorydorasHatchetfish
Temperature72–79 °F75–81 °F
pH6–7.85.5–7.5
Adult size2.5 in1.5 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupGroups of 6+Groups of 6+
DietOmnivoreCarnivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can corydoras live with hatchetfish?

Yes. Corydoras and hatchetfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 20 gal.

What temperature suits both corydoras and hatchetfish?

75–79 °F. Corydoras need 72–79 °F, hatchetfish need 75–81 °F.

What size tank do corydoras and hatchetfish need together?

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