Can koi live with chinese algae eaters?

Verdict
No

No. Koi and chinese algae eaters should not share a tank. Koi are coldwater animals (59–77°F); chinese algae eaters need 74–80°F. They overlap only at 74–77°F, the edge of both ranges.

KoiKoi59–77°F · pH 7–8.5 Chinese algae eaterChinese algae eater74–80°F · pH 6–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–77°Koi 59–77°Chinese algae eater 74–80°
The green band is the temperature range both can live in.
456789Both: 7–8Koi 7–8.5Chinese algae eater 6–8
The green band is the pH both tolerate.

Size to scale

Koi · 24 inChinese algae eater · 10 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

KoiChinese algae eater
Temperature59–77 °F74–80 °F
pH7–8.56–8
Adult size24.0 in10.0 in
Minimum tankPond75 gal
TemperamentPeacefulSemi-aggressive
Swims atAll levelsBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreHerbivore

Better tank mates for koi

All koi tank mates

Better tank mates for chinese algae eaters

All chinese algae eater tank mates

Questions

Can koi live with chinese algae eaters?

No. Koi and chinese algae eaters should not share a tank. Koi are coldwater animals (59–77°F); chinese algae eaters need 74–80°F. They overlap only at 74–77°F, the edge of both ranges.

What temperature suits both koi and chinese algae eaters?

74–77 °F. Koi need 59–77 °F, chinese algae eaters need 74–80 °F.

What size tank do koi and chinese algae eaters need together?

A pond. Koi outgrow indoor tanks.