Yes, the white bone on the tail is what I was referring to as the surgeon(not sure what the bone is called). It's been four+ years since I was dealing with it, but if I remember correctly, it looks red, white and bumpy. Kind of like the STD pictures they showed you in High School(only reference I can think of). Often times it resulted in loss or partial loss of the bone. You can try pimafix and melafix in a display, but you will have to turn off your skimmer. I may have had some luck with those, but it has been a long time. You can ask Will from Premier this weekend. He was the person I learned from about fish disease, treatment and quarantine. I will be there also if you would like to discuss it.