Can killifish live with pygmy corys?

Verdict
Yes

Yes. Killifish and pygmy corys make a good pair. Both are fine at 72–77°F. Plan on at least 10 gal.

KillifishKillifish70–77°F · pH 5.5–7 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: 72–77°Killifish 70–77°Pygmy cory 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7Killifish 5.5–7Pygmy cory 6–7.5
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 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

KillifishPygmy cory
Temperature70–77 °F72–79 °F
pH5.5–76–7.5
Adult size2.5 in1.0 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for pygmy corys

All pygmy cory tank mates

Questions

Can killifish live with pygmy corys?

Yes. Killifish and pygmy corys make a good pair. Both are fine at 72–77°F. Plan on at least 10 gal.

What temperature suits both killifish and pygmy corys?

72–77 °F. Killifish need 70–77 °F, pygmy corys need 72–79 °F.

What size tank do killifish and pygmy corys need together?

At least 10 gal, set by the killifish. Add space for each extra fish.