🐠 Fish & Amphibians

Goldfish

Classic, long-lived and bigger than you think.

Goldfish can live for decades and grow large with good care. They are messy eaters and need much more space and filtration than the stereotypical bowl.

Lifespan10–20+ years
SizeSmall–Medium · 6–12 in
Care levelEasy
Typical cost$15–30 / month
Great for
FamiliesPond keepersPeacefulSocialHardy
Goldfish

Photo: לינה אבוגוש · CC BY-SA 3.0 · Wikimedia Commons

Care guide

Daily care

20+ gallons for one fancy goldfish, plus 10 per additional; strong filtration; ponds for common types.

Sinking goldfish pellets and blanched veggies like peas.

Ample swimming space.

Weekly 25–30% water changes.

Health

Common health concerns

Know what to watch for. Early detection makes most of these far easier and cheaper to treat.

  • Swim bladder disorder
  • Ich
  • Fin rot
  • Ammonia poisoning
  • Dropsy
Veterinary care

Vet visits

Aquatic vets exist in many cities — test water first.

Find a vet near me

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This guide is general information, not veterinary advice. Costs are rough U.S. estimates for food, supplies and routine care. Always consult a licensed veterinarian about your pet’s needs.