I think it's a case of being in unfamiliar surroundings and like Canadian_Man says it seems to go away if all other things are OK. Tangs seem to have fairly nervous/agitated dispositions (too much coffee in the ocean?). I guess if it continues beyond a few days/week-or-two then you might want to see what it is that's disturbing him, but for now it's not unexpected. Unfamiliar territory = fear of predation (?)
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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