Can killifish live with assassin snails?

Verdict

Yes, with care

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

Killifish70–77°F · pH 5.5–7

Assassin snail75–80°F · pH 7–8

What to watch

Watch outWater chemistry is a squeeze. The only pH that suits both is around 7.

What works

Both are fine at 75–77°F.
They use different parts of the tank: killifish the top, assassin snails the bottom.

Water side by side

The green band is the temperature range both can live in.

The green band is the pH both tolerate.

Size to scale

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

	Killifish	Assassin snail
Temperature	70–77 °F	75–80 °F
pH	5.5–7	7–8
Adult size	2.5 in	1.0 in
Minimum tank	10 gal	5 gal
Temperament	Peaceful	Peaceful
Swims at	Top	Bottom
Group	Alone or in pairs	Alone or in pairs
Diet	Carnivore	Carnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can killifish live with assassin snails?

Yes, with care. Killifish and assassin snails 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 assassin snails?

75–77 °F. Killifish need 70–77 °F, assassin snails need 75–80 °F.

What size tank do killifish and assassin snails need together?

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