Can goldfish live with black neon tetras?

Verdict

No. Goldfish and black neon tetras should not share a tank. Goldfish are coldwater animals (60–74°F); black neon tetras need 73–81°F. They overlap only at 73–74°F, the edge of both ranges.

Goldfish60–74°F · pH 7–8

Black neon tetra73–81°F · pH 5.5–7.5

What to watch

Deal breakerGoldfish are coldwater animals (60–74°F); black neon tetras need 73–81°F. They overlap only at 73–74°F, the edge of both ranges.
Watch outAt 10 inches a goldfish can swallow a small black neon 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

	Goldfish	Black neon tetra
Temperature	60–74 °F	73–81 °F
pH	7–8	5.5–7.5
Adult size	10.0 in	1.5 in
Minimum tank	40 gal	15 gal
Temperament	Peaceful	Peaceful
Swims at	All levels	Middle
Group	Alone or in pairs	Groups of 6+
Diet	Omnivore	Omnivore

Better tank mates for goldfish

All goldfish tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can goldfish live with black neon tetras?

No. Goldfish and black neon tetras should not share a tank. Goldfish are coldwater animals (60–74°F); black neon tetras need 73–81°F. They overlap only at 73–74°F, the edge of both ranges.

What temperature suits both goldfish and black neon tetras?

73–74 °F. Goldfish need 60–74 °F, black neon tetras need 73–81 °F.

What size tank do goldfish and black neon tetras need together?

At least 40 gal, set by the goldfish. Add space for each extra fish.