Can killifish live with silver dollars?

Verdict

Yes, with care

Yes, with care. Killifish and silver dollars can share a tank, but watch one thing. Silver dollars grow to 6 inches and need 75 gallons, far more than a tank set up for killifish.

Killifish70–77°F · pH 5.5–7

Silver dollar75–82°F · pH 5–7

What to watch

Watch outSilver dollars grow to 6 inches and need 75 gallons, far more than a tank set up for killifish.

What works

Both are fine at 75–77°F.
pH 5.5–7 suits both.
They use different parts of the tank: killifish the top, silver dollars the mid.

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	Silver dollar
Temperature	70–77 °F	75–82 °F
pH	5.5–7	5–7
Adult size	2.5 in	6.0 in
Minimum tank	10 gal	75 gal
Temperament	Peaceful	Peaceful
Swims at	Top	Middle
Group	Alone or in pairs	Groups of 5+
Diet	Carnivore	Herbivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can killifish live with silver dollars?

Yes, with care. Killifish and silver dollars can share a tank, but watch one thing. Silver dollars grow to 6 inches and need 75 gallons, far more than a tank set up for killifish.

What temperature suits both killifish and silver dollars?

75–77 °F. Killifish need 70–77 °F, silver dollars need 75–82 °F.

What size tank do killifish and silver dollars need together?

At least 75 gal, set by the silver dollar. Add space for each extra fish.