Hi All, You may often find this issue with your fish because this is another common reported disease of aquarium fish. Lets see some common symptoms, treatments and preventive measures - Symptoms - At first, fish develop red spots on the skin. These lesions expand to form ulcers and extensive erosions filled with necrotic tissue and mycelium. This is followed by the development of granulomas on the internal organs and death. Treatment and Control - Infected fish should be moved into high quality water, where they may recover if their clinical signs are mild. If disease occurs eradication is required. Once the disease is eradicated good husbandry, surveillance and biosecurity measures are necessary to prevent recurrence. In countries free of epizootic ulcerative syndrome, quarantine and health certificates are necessary for the movement of all live fish to prevent the introduction of the disease.