How to Care for a Goldfish
Vet-reviewed via PetHealth+ · Last reviewed June 2026
Goldfish grow large and produce heavy waste — they need spacious filtered tanks or ponds, not bowls. Fancy varieties may need 75+ litres per fish minimum.
Tank size
Common goldfish need far more space than pet shops suggest.
Filtration
Robust filtration handles high bioload.
Lifespan
Well-kept goldfish live 10–20+ years.
Related: Goldfish profile
Frequently asked questions
Can goldfish live in bowls?
No — bowls cannot maintain water quality for long-term health.
Do goldfish need a heater?
Room-temperature stable environments often suffice; avoid extremes.
Can goldfish live with tropical fish?
Goldfish prefer cooler water — mixing is usually inappropriate.
How often feed goldfish?
Small amounts once or twice daily; they always seem hungry.