Can killifish live with serpae tetras?

Verdict
Yes

Yes, killifish and serpae tetras can live together. Both are fine at 72–77°F. Plan on at least 20 gal.

KillifishKillifish70–77°F · pH 5.5–7 Serpae tetraSerpae tetra72–79°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°Serpae tetra 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7Killifish 5.5–7Serpae tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 inSerpae tetra · 1.75 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

KillifishSerpae tetra
Temperature70–77 °F72–79 °F
pH5.5–76–7.5
Adult size2.5 in1.75 in
Minimum tank10 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for serpae tetras

All serpae tetra tank mates

Questions

Can killifish live with serpae tetras?

Yes, killifish and serpae tetras can live together. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both killifish and serpae tetras?

72–77 °F. Killifish need 70–77 °F, serpae tetras need 72–79 °F.

What size tank do killifish and serpae tetras need together?

At least 20 gal, set by the serpae tetra. Add space for each extra fish.