Can fancy goldfish live with glowlight tetras?

Verdict

No. Fancy goldfish and glowlight tetras should not share a tank. Fancy goldfish are coldwater animals (65–74°F); glowlight tetras need 74–80°F. They meet only at 74°F, the edge of both ranges.

Fancy goldfish65–74°F · pH 7–8

Glowlight tetra74–80°F · pH 6–7.5

What to watch

Deal breakerFancy goldfish are coldwater animals (65–74°F); glowlight tetras need 74–80°F. They meet only at 74°F, the edge of both ranges.
Watch outA grown fancy goldfish may treat small glowlight tetras as food, especially at night.

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

	Fancy goldfish	Glowlight tetra
Temperature	65–74 °F	74–80 °F
pH	7–8	6–7.5
Adult size	6.0 in	1.5 in
Minimum tank	30 gal	10 gal
Temperament	Peaceful	Peaceful
Swims at	All levels	Middle
Group	Alone or in pairs	Groups of 6+
Diet	Omnivore	Omnivore

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Questions

Can fancy goldfish live with glowlight tetras?

No. Fancy goldfish and glowlight tetras should not share a tank. Fancy goldfish are coldwater animals (65–74°F); glowlight tetras need 74–80°F. They meet only at 74°F, the edge of both ranges.

What temperature suits both fancy goldfish and glowlight tetras?

74–74 °F. Fancy goldfish need 65–74 °F, glowlight tetras need 74–80 °F.

What size tank do fancy goldfish and glowlight tetras need together?

At least 30 gal, set by the fancy goldfish. Add space for each extra fish.