I have a fantail goldfish in a small tank which floats upside down on the surface and has a large belly?

Take the fish back. Fancy goldfish need to be in a tank that is 25 gallons for ONE fish plus 10 gallons for each additional fish. So 3 fancy goldfish need a 55 gallon tank.

Since they can grow up to 8 or 10 inches you will need a much larger tank eventually. If you want to keep the 9 gallon tank you could have a few (2-3 guppies) in there (tho guppies do better with 10-15 gallons) or ONE male Betta and a few snails in your 9 gallon tank.

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