Can killifish live with endlers?

Verdict
Yes, with care

Yes, with care. Killifish and endlers can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.

KillifishKillifish70–77°F · pH 5.5–7 Endler's livebearerEndler's livebearer72–82°F · pH 7–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Killifish 70–77°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7Killifish 5.5–7Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 inEndler's livebearer · 1 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

KillifishEndler's livebearer
Temperature70–77 °F72–82 °F
pH5.5–77–8
Adult size2.5 in1.0 in
Minimum tank10 gal5 gal
TemperamentPeacefulPeaceful
Swims atTopTop
GroupAlone or in pairsGroups of 3+
DietCarnivoreOmnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can killifish live with endlers?

Yes, with care. Killifish and endlers can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.

What temperature suits both killifish and endlers?

72–77 °F. Killifish need 70–77 °F, endlers need 72–82 °F.

What size tank do killifish and endlers need together?

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