Can hatchetfish live with pygmy corys?

Verdict
Yes

Yes, hatchetfish and pygmy corys can live together. Both are fine at 75–79°F. Plan on at least 20 gal.

HatchetfishHatchetfish75–81°F · pH 5.5–7.5 Pygmy coryPygmy cory72–79°F · pH 6–7.5

Why it works

Water side by side

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

Size to scale

Hatchetfish · 1.5 inPygmy cory · 1 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

HatchetfishPygmy cory
Temperature75–81 °F72–79 °F
pH5.5–7.56–7.5
Adult size1.5 in1.0 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 6+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for hatchetfish

All hatchetfish tank mates

Better tank mates for pygmy corys

All pygmy cory tank mates

Questions

Can hatchetfish live with pygmy corys?

Yes, hatchetfish and pygmy corys can live together. Both are fine at 75–79°F. Plan on at least 20 gal.

What temperature suits both hatchetfish and pygmy corys?

75–79 °F. Hatchetfish need 75–81 °F, pygmy corys need 72–79 °F.

What size tank do hatchetfish and pygmy corys need together?

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