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AMMONIA BURNS! common goldfish need huge tanks of 50+ gallons and not even babies should be in a 2.5 gallon tank. They grow to well over a foot. Do daily 50% or more water changes as toxins will build up fast. Buy a 55+ gallon tank, or rehome them. Maybe a local fish store will try to save them. Good luck :)

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Q: You have 3 large goldfish one is sudently turned black they are in a 2.5 gallon fish tank please help what do you do?
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