Can cherry barbs live with killifish?

Verdict
Yes

Yes. Cherry barbs and killifish make a good pair. Both are fine at 73–77°F. Plan on at least 20 gal.

Cherry barbCherry barb73–81°F · pH 6–7.5 KillifishKillifish70–77°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–77°Cherry barb 73–81°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Cherry barb 6–7.5Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Cherry barb · 2 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

Cherry barbKillifish
Temperature73–81 °F70–77 °F
pH6–7.55.5–7
Adult size2.0 in2.5 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for cherry barbs

All cherry barb tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can cherry barbs live with killifish?

Yes. Cherry barbs and killifish make a good pair. Both are fine at 73–77°F. Plan on at least 20 gal.

What temperature suits both cherry barbs and killifish?

73–77 °F. Cherry barbs need 73–81 °F, killifish need 70–77 °F.

What size tank do cherry barbs and killifish need together?

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