Heniochus (banner fish) are among the easier to keep butterflies. However, tangs tend to pick on or inspect closely any new fish, especially a decent sized one. I use an isolation chamber made of eggcrate (8"x8"x12") to get my new fish used to the tank & my old fish used to my new fish for a week before releasing it into the general population. Have had very good success so far with this method. Also make sure that there are plenty of hiding places like caves for each fish to call its own. That'll cut down on the territorial fighting.
By the way, Chevron tangs are most beautiful & expensive when juveniles - take a look at pics of adult ones before you invest in one to make sure the "final" product is worth the price. For some it is, for me, not so much.
JME & O
Anthony
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