Can tiger barbs live with killifish?

Verdict
Yes

Yes. Tiger barbs and killifish make a good pair. Both are fine at 72–77°F. Plan on at least 30 gal.

Tiger barbTiger barb72–81°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: 72–77°Tiger barb 72–81°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Tiger barb 6–7.5Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Tiger barb · 3 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

Tiger barbKillifish
Temperature72–81 °F70–77 °F
pH6–7.55.5–7
Adult size3.0 in2.5 in
Minimum tank30 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for tiger barbs

All tiger barb tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can tiger barbs live with killifish?

Yes. Tiger barbs and killifish make a good pair. Both are fine at 72–77°F. Plan on at least 30 gal.

What temperature suits both tiger barbs and killifish?

72–77 °F. Tiger barbs need 72–81 °F, killifish need 70–77 °F.

What size tank do tiger barbs and killifish need together?

At least 30 gal, set by the tiger barb. Add space for each extra fish.