How to Fix Swim Bladder Disease in Goldfish

If your goldfish is swimming sideways or upside-down, it may have swim bladder disorder. Goldfish have a swim bladder that helps them stay afloat. Constipation, enlarged organs, or infection can all cause the swim bladder to stop functioning properly. In many cases swim bladder disorder can be remedied by changing the fish's diet or cleaning the tank. Fancy goldfish are more commonly affected than other fish.