My tangs (Sailfin, Purple and Clown) as well as a Blueface Angel suddenly after 2 years started to develop some very difiguring qualities. There fins are getting ragged and shredded. They do not fight, and there appears to be several holes in the head area. I have heard of HLE, but I have no experience dealing with it. I read that sometimes stray electrical currents cause this so I bought a ground probe recently. However, if anyone has any other ideas please let me know. Also are the disfiguring holes permanent or will they regenerate. Like I said I have these fish with no problems for over 2 years and now this. Very frustrating.