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Common Goldfish · Comet Goldfish
NOT a bowl fish — a 10-year pond companion in the making
The most misunderstood pet: common goldfish grow to 30 cm and live 10–15 years in a 40+ gallon tank or pond with strong filtration. In the right setup they learn to hand-feed.
Photo: Wikimedia Commons / George Chernilevsky / Public domain
Care guide last reviewed: · Care requirements referenced from veterinary and humane standards.
40+ gallon tank or outdoor pond with strong filtration. Never a bowl.
Virtually silent (1/5)
Highly independent — comfortable alone 8+ hours
Thrives with daily company
Curated starter supplies researched for this companion's specific anatomy and needs
Goldfish lack true stomachs and produce immense ammonia waste; high-capacity multi-stage canister filters process heavy biological bioloads cleanly.
Floating flakes cause fancy goldfish to gulp surface air, leading to swim bladder disease; slow-sinking digestive pellets keep them foraging down at substrate level.
Goldfish are sensitive to tap chloramines; Seachem Prime detoxifies tap chlorine while temporarily binding lethal spikes of ammonia and nitrite.
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