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The maximum size of a fully grown common goldfish is almost two feet (60 cm) in length and weighing close to ten pounds (4.5kg). Most goldfish won't grow that large but can easily grow to around 12 inches (30cm) and weighing five ponds (2.25kg). A goldfish will never grow to its potential if it is placed in tank too small or in less than ideal water conditions.

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15y ago

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