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[kien]

As to the "why" question, personally I think the clown tang has a similar shape to the powder brown.

powder brown vs clown tang
.. ..

The clown tang may establish himself enough to fight back once you put the powder brown back in, maybe. Assuming the clown tang hasn't already kicked the bucket. Funny, I see LFS bring in clown tangs ALL the time and they are beautiful fish, but I have never seen a clown tang in any hobbyists tank.. poor little guys, they really do belong in the sea probably.