Whats up with my tang?

[MaineReef88]

I am wondering what is wrong with my Yellow tang,
I have only had him for about 3-4 weeks, he is a good size and seems very healthy -
However I today noticed that his body and fins have this reddish brown splotchy / streaking stuff on them,
All I can tell you is it Kinda looks like detritus (though I know its not cuz its on the fish) but thats what it looks like, What is it???
He is still eating great - like a horse, and it could be my complete imagination but it seems to lessen in intensity while he is eating, but that could just be my eyes playing tricks on me.

Does anyone have any ideas??

All water params are great by the way.

Thanks!

And I am no good at pics so I dont have one, let me know if you
MUST see one to identify
Thanks

 

[shawna1972]

photo would help

 

[MaineReef88]

Thanks, But I got it all figured out on another site, It was a bacterial infection. Seems to be doing better now.

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