I've read that sometimes it helps to rearrange the aquascaping in your tank when introducing new fish - supposedly all the fish are more on an equal basis trying to figure out the `lay of the land' ... then more likely not to get into territorial disputes.
I have a yellow tang that is the chief of the tank - I do have plenty of places for fish to run to, to hide in and so on ... 75 pounds of live rock in a 33 gallon aquarium; I've found that the yellow tang has toned down his aggressiveness since the other fish are able to disappear readily if he does gets aggressive.
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If my wife asks ... it was about twenty bucks.
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