Common Goldfish

Carassius auratus

A coldwater classic that grows far bigger and lives far longer than a bowl can support.

Water

Freshwater

Temperature

60–74°F

pH

6.5–8.5

Hardness

8–25 dGH

Max size

12 in

Min tank

75 gal

Temperament

Peaceful

Social

Groups (2+)

Swim level

All

Diet

Omnivore

Care level

Beginner

Lifespan

10-20 years

Breeding

Egg-scatterer

Suitability

Intermediate

Origin

East Asia (domesticated)

Single-tailed goldfish like the common and comet are big, messy, long-lived fish that belong in large tanks or ponds, not bowls. They produce heavy waste and need strong filtration and cool water.