10-26-2010, 04:48 PM
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I was asked to offer my input in this thread, so I will do what I can. I willl 2nd the question about how big the tang is? Also, I didn't see a nitrate reading?
I notice that is quite a bit of fish in a 30 gallon tank, so I would expect that is having something to do with the problem, but without a photo, there isn't a whole lot anyone can do. A clear photo of the tang, a clear photo of the whole tank, and if you can get clear close up of the injured area of the fish and also the white spot you mentioned... that will tell a lot more and make for an easier diagnosis.
Are there any other symptoms? Eyes are clear? Gills are normal, not inflamed or irritated? Fins clamped? How do the other fish look and behave?
How large is the quarantine tank? Have you tried any medications or treatments thus far? If so, what have you tried?
As I said, I will do all I can, but need a lot more info and some photos to do much of anything.