6ddd20e8_Common_diseases_of_goldfish__Treatment
[Disease and Causes] Fungus Caused by Saprolegnia and Achlya [Symptoms] Fluffy growths affecting wounds on the skin and fins of freshwater fishes. [Reason for Infection] Usually a secondary infection that invades wounds left by ulcers and parasites, including whitespot. Rarely a problem in tanks with good water quality. [Action] Improve water conditions and treat promptly. [Treatment] 
Standard anti-fungal medications, such as methylene blue, are usually very effective, but may affect filtration and water quality. When the disease occurs on open wounds, aquarium salt at a dose of 1-3g/litre can help reduce salt loss. Cotton-wool disease (Flexibacter) looks similar but is caused by bacteria and may require a different treatment.
Common diseases of goldfish
Treatment