You can try the mirror trick, I use it whenever adding a new fish in my tank as my kole loves to bully new arrivals. With the mirror in there the Kole then spends more time attacking it's own reflection rather then the new arrival.
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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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