Blue Planet Fungus Cure is a medication used to treat fungal diseases that are common in freshwater fish such as; mouth, fin & tail fungus and are recognised by white or grey threads on the skin or fins which may thicken until they resemble tufts of cotton wool (pin head size) on the fish body and fins. Unless prompt action is taken fatalities will occur. Symptoms to look out for, to help determine if this medication is required include; Ripped fins, Cotton like fluff seen on the mouth, fins or body and Clamped fins. These are simple symptoms, please discuss with your aquarium store specialist if you are not certain.