Can killifish live with elephant nose fish?

Verdict
Yes

Yes. Killifish and elephant nose fish get along in the same tank. Both are fine at 73–77°F. Plan on at least 55 gal.

KillifishKillifish70–77°F · pH 5.5–7 Elephant nose fishElephant nose fish73–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–77°Killifish 70–77°Elephant nose fish 73–82°
The green band is the temperature range both can live in.
456789Both: 6–7Killifish 5.5–7Elephant nose fish 6–7.5
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 inElephant nose fish · 9 in0"1"2"3"4"5"6"7"8"9"
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

KillifishElephant nose fish
Temperature70–77 °F73–82 °F
pH5.5–76–7.5
Adult size2.5 in9.0 in
Minimum tank10 gal55 gal
TemperamentPeacefulSemi-aggressive
Swims atTopBottom
GroupAlone or in pairsAlone or in pairs
DietCarnivoreCarnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for elephant nose fish

All elephant nose fish tank mates

Questions

Can killifish live with elephant nose fish?

Yes. Killifish and elephant nose fish get along in the same tank. Both are fine at 73–77°F. Plan on at least 55 gal.

What temperature suits both killifish and elephant nose fish?

73–77 °F. Killifish need 70–77 °F, elephant nose fish need 73–82 °F.

What size tank do killifish and elephant nose fish need together?

At least 55 gal, set by the elephant nose fish. Add space for each extra fish.