Could always try introducing new fish late late at night when all the fish are well asleep (assuming you don't already do this). I find this helps. Not 100% bulletproof method but it does help. This gives the new fish a chance to explore while everyone is asleep, and figure out where everything and everyone is. Plus, the established fish are usually too tired to bother to chase anyone around for too long. By the morning sometimes the fish just seem to think that the new fish has been there all along. Anyway, I only introduce fish late at night and it seems to work out most of the time for me. I have 4 tangs that get along pretty well.
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