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[kien]

I suspect your brown tang feels threatened. Also, I've noticed that clown tangs are very skittish and and easily bullied. The brown will probably keep bullying him for as long as he can get away with it. Clown tangs are actually quite hard to keep. Yours will probably be doomed.. Try taking out the brown tang and placing him in qurantine to give the clown tang some hope of making it.