PBT SICK in REEF...HELP?

[salt-rookie]

OK...I have had this Powder Blue Tang three months...NEVER a spot of ich. Eats like a pig. I was without power for 51.5 hours last Sunday, Monday and Tuesday. Monday morning I realized that my water temp had dropped to like 70 degrees. I gradually pulled it up to 76 and when my power came back on, the tank returned to the normal temp of 79 degrees. NOTHING else has happened or changed.

Last night I noticed that his colors were light and very splotchy....here's a picture (Please click on it and it will get larger so you can see this in more detail). A couple of times he darted through the tank as though he might be itching or uncomfortable. Lights went out at 10:00 last night and I hoped the dark might help.

Lights on at 10:00 AM this morning, and the areas that were splotchy are now colored back up and appear to be whelps on his flesh. I got a picture of this also. I cannot find any information on this, and I'm wondering if anyone has any CLUE as to what this could be, is it treatable? Any info would be GREAT!

Another note, this is a fish that is usually very active and swims the entire tank all day. He now hovers under one coral and did not eat this morning. PLEASE Click and Look...then tell me what to do!!!

Thanks,
Phil

[Skipper]

[moved]