Can koi live with arowanas?

Verdict

No. Koi and arowanas should not share a tank. Koi are coldwater animals (59–77°F); arowanas need 75–86°F. They overlap only at 75–77°F, the edge of both ranges.

Koi59–77°F · pH 7–8.5

Silver arowana75–86°F · pH 6–7

What to watch

Deal breakerKoi are coldwater animals (59–77°F); arowanas need 75–86°F. They overlap only at 75–77°F, the edge of both ranges.
Deal breakerArowanas are aggressive and will bully peaceful koi.
Watch outWater chemistry is a squeeze. The only pH that suits both is around 7.

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 arowana
Temperature	59–77 °F	75–86 °F
pH	7–8.5	6–7
Adult size	24.0 in	36.0 in
Minimum tank	Pond	250 gal
Temperament	Peaceful	Aggressive
Swims at	All levels	Top
Group	Groups of 3+	One per tank
Diet	Omnivore	Carnivore

Better tank mates for koi