Can bettas live with fancy goldfish?

Verdict

No. Bettas and fancy goldfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); bettas need 76–82°F. No temperature suits both.

Betta76–82°F · pH 6.5–7.5

Fancy goldfish65–74°F · pH 7–8

What to watch

Deal breakerFancy goldfish are coldwater animals (65–74°F); bettas need 76–82°F. No temperature suits both.
Watch outMale bettas often attack bright, long-finned fish like fancy goldfish, mistaking them for rivals.

What works

pH 7–7.5 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

	Betta	Fancy goldfish
Temperature	76–82 °F	65–74 °F
pH	6.5–7.5	7–8
Adult size	2.5 in	6.0 in
Minimum tank	5 gal	30 gal
Temperament	Semi-aggressive	Peaceful
Swims at	Top	All levels
Group	One per tank	Alone or in pairs
Diet	Carnivore	Omnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Questions

Can bettas live with fancy goldfish?

No. Bettas and fancy goldfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); bettas need 76–82°F. No temperature suits both.

What temperature suits both bettas and fancy goldfish?

None. Bettas need 76–82 °F and fancy goldfish need 65–74 °F, so the ranges do not meet.

What size tank do bettas and fancy goldfish need together?

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