I'm always a big fan of putting a mirror on the tank when introducing new fish. It has always worked for me. It tends to keep the aggressive fish occupied while the new one gets established. You can also try changing your rock work around.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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