Can sparkling gouramis live with killifish?

Verdict
Yes

Yes. Sparkling gouramis and killifish make a good pair. Both are fine at 72–77°F. Plan on at least 10 gal.

Sparkling gouramiSparkling gourami72–82°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°Sparkling gourami 72–82°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Sparkling gourami 6–7.5Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Sparkling gourami · 1.5 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

Sparkling gouramiKillifish
Temperature72–82 °F70–77 °F
pH6–7.55.5–7
Adult size1.5 in2.5 in
Minimum tank5 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopTop
GroupGroups of 4+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for sparkling gouramis

All sparkling gourami tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can sparkling gouramis live with killifish?

Yes. Sparkling gouramis and killifish make a good pair. Both are fine at 72–77°F. Plan on at least 10 gal.

What temperature suits both sparkling gouramis and killifish?

72–77 °F. Sparkling gouramis need 72–82 °F, killifish need 70–77 °F.

What size tank do sparkling gouramis and killifish need together?

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