Can koi live with silver dollars?

Verdict

No. Koi and silver dollars should not share a tank. Koi are coldwater animals (59–77°F); silver dollars need 75–82°F. They overlap only at 75–77°F, the edge of both ranges.

Koi59–77°F · pH 7–8.5

Silver dollar75–82°F · pH 5–7

What to watch

Deal breakerKoi are coldwater animals (59–77°F); silver dollars need 75–82°F. They overlap only at 75–77°F, the edge of both ranges.
Watch outWater chemistry is a squeeze. The only pH that suits both is around 7.
Watch outA grown koi may treat small silver dollars as food, especially at night.

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

	Koi	Silver dollar
Temperature	59–77 °F	75–82 °F
pH	7–8.5	5–7
Adult size	24.0 in	6.0 in
Minimum tank	Pond	75 gal
Temperament	Peaceful	Peaceful
Swims at	All levels	Middle
Group	Groups of 3+	Groups of 5+
Diet	Omnivore	Herbivore

Better tank mates for koi

All koi tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can koi live with silver dollars?

No. Koi and silver dollars should not share a tank. Koi are coldwater animals (59–77°F); silver dollars need 75–82°F. They overlap only at 75–77°F, the edge of both ranges.

What temperature suits both koi and silver dollars?

75–77 °F. Koi need 59–77 °F, silver dollars need 75–82 °F.

What size tank do koi and silver dollars need together?

A pond. Koi outgrow indoor tanks.