Can corydoras live with killifish?

Verdict
Yes

Yes, corydoras and killifish can live together. Both are fine at 72–77°F. Plan on at least 20 gal.

CorydorasCorydoras72–79°F · pH 6–7.8 KillifishKillifish70–77°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Corydoras 72–79°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Corydoras 6–7.8Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inKillifish · 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

CorydorasKillifish
Temperature72–79 °F70–77 °F
pH6–7.85.5–7
Adult size2.5 in2.5 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can corydoras live with killifish?

Yes, corydoras and killifish can live together. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both corydoras and killifish?

72–77 °F. Corydoras need 72–79 °F, killifish need 70–77 °F.

What size tank do corydoras and killifish need together?

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