Can koi live with paradise fish?

Verdict
Yes, with care

Yes, with care. Koi and paradise fish can share a tank, but watch one thing. At 24 inches a koi can swallow a small paradise fish. Fast, alert fish usually stay out of reach.

KoiKoi59–77°F · pH 7–8.5 Paradise fishParadise fish61–79°F · pH 6–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 61–77°Koi 59–77°Paradise fish 61–79°
The green band is the temperature range both can live in.
456789Both: 7–8Koi 7–8.5Paradise fish 6–8
The green band is the pH both tolerate.

Size to scale

Koi · 24 inParadise fish · 3.5 in0"6"12"18"24"
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

KoiParadise fish
Temperature59–77 °F61–79 °F
pH7–8.56–8
Adult size24.0 in3.5 in
Minimum tankPond20 gal
TemperamentPeacefulSemi-aggressive
Swims atAll levelsTop
GroupGroups of 3+One per tank
DietOmnivoreOmnivore

Better tank mates for koi

All koi tank mates

Better tank mates for paradise fish

All paradise fish tank mates

Questions

Can koi live with paradise fish?

Yes, with care. Koi and paradise fish can share a tank, but watch one thing. At 24 inches a koi can swallow a small paradise fish. Fast, alert fish usually stay out of reach.

What temperature suits both koi and paradise fish?

61–77 °F. Koi need 59–77 °F, paradise fish need 61–79 °F.

What size tank do koi and paradise fish need together?

A pond. Koi outgrow indoor tanks.