6ddd20e8_Common_diseases_of_goldfish__Treatment
[Disease and Causes] Swimbladder disorder Caused by bacterial infection, incorrect diet, trapped gas, physical deformities. [Symptoms] Fish have difficulty swimming to the surface, or to the lower levels of the tank. Commonly affects egg-shaped fancy goldfish. [Reason for Infection] Sometimes caused by poor water quality. Genetic problems in selectively-bred goldfish. [Action] Improve water conditions. Feed less dried foods, or pre-soak pellets and flakes so they don't swell the gut. Feed Daphnia, which acts as a laxative. [Treatment] 
Change diet and improve water conditions. Treat with a specialist anti-bacteria treatment. Fancy goldfish suffering from physical deformities will not recover.
Common diseases of goldfish
Treatment