Can killifish live with lemon tetras?

Verdict
Yes

Yes, killifish and lemon tetras can live together. Both are fine at 72–77°F. Plan on at least 15 gal.

KillifishKillifish70–77°F · pH 5.5–7 Lemon tetraLemon tetra72–82°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Killifish 70–77°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 5.5–7Killifish 5.5–7Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 inLemon tetra · 2 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

KillifishLemon tetra
Temperature70–77 °F72–82 °F
pH5.5–75.5–7.5
Adult size2.5 in2.0 in
Minimum tank10 gal15 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for lemon tetras

All lemon tetra tank mates

Questions

Can killifish live with lemon tetras?

Yes, killifish and lemon tetras can live together. Both are fine at 72–77°F. Plan on at least 15 gal.

What temperature suits both killifish and lemon tetras?

72–77 °F. Killifish need 70–77 °F, lemon tetras need 72–82 °F.

What size tank do killifish and lemon tetras need together?

At least 15 gal, set by the lemon tetra. Add space for each extra fish.