Can neon tetras live with killifish?

Verdict
Yes

Yes, neon tetras and killifish can live together. Both are fine at 72–77°F. Plan on at least 10 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 KillifishKillifish70–77°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Neon tetra 72–79°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Neon tetra 6–7Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Neon tetra · 1.5 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

Neon tetraKillifish
Temperature72–79 °F70–77 °F
pH6–75.5–7
Adult size1.5 in2.5 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can neon tetras live with killifish?

Yes, neon tetras and killifish can live together. Both are fine at 72–77°F. Plan on at least 10 gal.

What temperature suits both neon tetras and killifish?

72–77 °F. Neon tetras need 72–79 °F, killifish need 70–77 °F.

What size tank do neon tetras and killifish need together?

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