I have 2 paccu about 1.5 feet long . . one of them developed an ulcer on the face above the mouth . . I thought it would heal but after 2 days it got infected. It has strands like cottonwool on it . . Is that fungal ? what medicines ca i use ? I have moved it to a separate tank and used salt
The PIC is before it got infected

The PIC is before it got infected

