Yellow tang

My tang developed some scaring around his right eye. I don't keep any fish that would challenge him. He's well over 4 inches . All I have in there with him is a clarkie clown,damsel,and a puffer.

Looks bad hasn't eat since yesturday morning. Any ideas of the cause.
 
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Also, the tang may have simply bumped into a rock. Have you fed any greens lately?
 
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