Can killifish live with dwarf gouramis?

Verdict
Yes

Yes. Killifish and dwarf gouramis get along in the same tank. Both are fine at 72–77°F. Plan on at least 10 gal.

KillifishKillifish70–77°F · pH 5.5–7 Dwarf gouramiDwarf gourami72–82°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°Dwarf gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7Killifish 5.5–7Dwarf gourami 6–7.5
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 inDwarf gourami · 3 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

KillifishDwarf gourami
Temperature70–77 °F72–82 °F
pH5.5–76–7.5
Adult size2.5 in3.0 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopTop
GroupAlone or in pairsAlone or in pairs
DietCarnivoreOmnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for dwarf gouramis

All dwarf gourami tank mates

Questions

Can killifish live with dwarf gouramis?

Yes. Killifish and dwarf gouramis get along in the same tank. Both are fine at 72–77°F. Plan on at least 10 gal.

What temperature suits both killifish and dwarf gouramis?

72–77 °F. Killifish need 70–77 °F, dwarf gouramis need 72–82 °F.

What size tank do killifish and dwarf gouramis need together?

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