I have a yellow tang that is two years old in the tank and recently got a powder brown tang. I had the PBT in an acclimation box for 3 days to get the yellow used to him. The first day he would go after the PBT but the next two days he ignored him. So I thought it was cool. I released the PBT in the tank during feeding time and within 5 minutes the yellow was relentless. So I put three mirrors around the tank to distract him and now he will not stop attacking his reflection. He's completely ignoring the new PBT but the "new yellow" is a mortal enemy it seems. Will this subside after a while? The PBT doesn't seem to like his reflection too much either.