hole in the head disease

[rocknroll]

Anyone have any suggestions to treating hole in the head disease (I think it's also called lateral line erosion)? I picked up a tank from a guy who had neglected it and it came with a maroon clown, percula clown and yellow tang that are all suffering from it. The yellow tang is pretty bad but the 2 clowns aren't that bad. I've had the tank for about a month and they seem to be doing ok - is there anything particular I should be treating with. Also, just noticed this morning on the end of one of the maroon's cheek spines it is whitish - looks slimy - could this be ick? Thanks.

Steve