Can ember tetras live with killifish?

Verdict
Yes

Yes. Ember tetras and killifish get along in the same tank. Both are fine at 73–77°F. Plan on at least 10 gal.

Ember tetraEmber tetra73–84°F · pH 5.5–7 KillifishKillifish70–77°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–77°Ember tetra 73–84°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 5.5–7Ember tetra 5.5–7Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Ember tetra · 0.8 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

Ember tetraKillifish
Temperature73–84 °F70–77 °F
pH5.5–75.5–7
Adult size0.8 in2.5 in
Minimum tank5 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for ember tetras

All ember tetra tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can ember tetras live with killifish?

Yes. Ember tetras and killifish get along in the same tank. Both are fine at 73–77°F. Plan on at least 10 gal.

What temperature suits both ember tetras and killifish?

73–77 °F. Ember tetras need 73–84 °F, killifish need 70–77 °F.

What size tank do ember tetras and killifish need together?

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