So I have a 90 gallon cube tank and have had a 4-5 inch purple tang for about 11 months. I recently added a sailfin and mimic tang to the mix. At the recommendation of my LFS I put up a mirror to distract my purple tang when I added the other two tangs in the evening. By mid-morning the following day, the purple was still in "attack mode" and going after both of the other tangs. I have put him in a breeder box to make sure he doesn't kill the sailfin or the mimic. Any ideas on how I should proceed?