Clown tangs tend to be quite aggressive. I would try what you are planning (ie. move the rockwork & then reintroduce). In the past, with tangs, what worked for me was to keep the new tang in a plexi isolation chamber until the other fish get used to it. Then when I release the new fish, the others seem almost to ignore it.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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