Can koi live with glowlight tetras?

Verdict

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

Koi59–77°F · pH 7–8.5

Glowlight tetra74–80°F · pH 6–7.5

What to watch

Deal breakerKoi are coldwater animals (59–77°F); glowlight tetras need 74–80°F. They overlap only at 74–77°F, the edge of both ranges.
Watch outAt 24 inches a koi can swallow a small glowlight tetra. Fast, alert fish usually stay out of reach.

What works

pH 7–7.5 suits both.

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	Glowlight tetra
Temperature	59–77 °F	74–80 °F
pH	7–8.5	6–7.5
Adult size	24.0 in	1.5 in
Minimum tank	Pond	10 gal
Temperament	Peaceful	Peaceful
Swims at	All levels	Middle
Group	Groups of 3+	Groups of 6+
Diet	Omnivore	Omnivore

Better tank mates for koi

All koi tank mates

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Questions

Can koi live with glowlight tetras?

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

What temperature suits both koi and glowlight tetras?

74–77 °F. Koi need 59–77 °F, glowlight tetras need 74–80 °F.

What size tank do koi and glowlight tetras need together?

A pond. Koi outgrow indoor tanks.