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If your fish has turned white as opposed to become covered in white fungussy stuff, you can assume that is simply the fish developing its adult colouring. Goldfish start off grey/silver and as they grow up their adult/mature colours develop. If it is white fungussy stuff on the fish you need to do some seroius cleaning of the tank and replace the water a few times. You probably would be wise to strip the tank down and scrub everything. There are medications available at pet shops for fungus.

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∙ 17y ago

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