I have a false perc. in hospital tank at the moment. It began having a raised brownish bump under the chin, shortly after being introduced to the main tank.
After a while (5-7 days maybe), a white fuzz appeared on the bump.
When I searched posts, I found that white fuzz is generally taken to be a bacterial infection, so I began treating with Nifurpirinol antibiotic (Aqua Furan). I'm not sure it is helping though.
Anyway, I'm tagging along on your thread
sorenb