Over a month ago now, my yellow tang developed some white bumps. I've witnessed ich in the past, not in this tank, and it does not appear to be that. The bumps are larger and more pronounced than ich and the bumps have stayed in the same place the whole time. Only in the last couple of days, some brown marks have started showing up. I haven't seen him scratching or flashing once and he still eats like a pig. I've had this tang for a year and a half, and the most recent fish was added six months ago. Does anyone have an idea of what this might be and how to cure it? Bacterial?