Please help

[TimmyVoo]

I have had a mata tang for 3 weeks now and he is a vicious eater. He was tank raised from a professional company and he looked great. Ever since I put him in he has had a block circles in different spots of his body and they turn into red spots (like ulcers). Idk what they are I've never seen anything like it. He has had them but still continues to act fine. I've been waiting it out but he still can't get rid of it please help!

 

[ccCapt]

Hard to tell from the pics, but some tangs get that blotchy look when they are stressed. What size tank is it in? Are you aware that species of tang grows to up to 20"?

 

[TimmyVoo]

I have a 125 gallon and information is limited on this fish and everywhere I look I get mixed results on size. I don't think it's from stress is like a black circles I've never seen anything like it

 

[0o.Kelsey.o0]

I've never seen anything like that, looks like its internal bleeding in the second picture...really odd