TankmateChecker

Can goldfish live with flowerhorns?

Verdict

No

No. Goldfish and flowerhorns should not share a tank. Goldfish are coldwater animals (60–74°F); flowerhorns need 80–89°F. No temperature suits both.

Goldfish

Goldfish60–74°F · pH 7–8

Flowerhorn

Flowerhorn80–89°F · pH 7–8

What to watch

Deal breakerGoldfish are coldwater animals (60–74°F); flowerhorns need 80–89°F. No temperature suits both.
Deal breakerFlowerhorns are aggressive and will bully peaceful goldfish.

What works

pH 7–8 suits both.

Water side by side

The ranges do not meet, so one of them would always be too warm or too cold.

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	Flowerhorn
Temperature	60–74 °F	80–89 °F
pH	7–8	7–8
Adult size	10.0 in	12.0 in
Minimum tank	40 gal	75 gal
Temperament	Peaceful	Aggressive
Swims at	All levels	Middle
Group	Alone or in pairs	One per tank
Diet	Omnivore	Carnivore

Better tank mates for goldfish

All goldfish tank mates

Questions

Can goldfish live with flowerhorns?

No. Goldfish and flowerhorns should not share a tank. Goldfish are coldwater animals (60–74°F); flowerhorns need 80–89°F. No temperature suits both.

What temperature suits both goldfish and flowerhorns?

None. Goldfish need 60–74 °F and flowerhorns need 80–89 °F, so the ranges do not meet.

What size tank do goldfish and flowerhorns need together?

At least 75 gal, set by the flowerhorn. Add space for each extra fish.