the rock says...
dealing with triggerfish can be a toss up, some will be very peaceful while others will be very aggressive and bully every other fish in the tank, they all have the ability to do so, from the bursa to the queen. over time you may have the greatest trouble, try to get them relatively the same size, often times the larger they get the more aggressive and fiesty they get. be ready to spend on lot on food too as they are constantly wanting to be fed and that is what lends to their popularity as they aggressively wait at the front of the tank swimming back and forth hoping to get some good food. it really is a crap shoot as you may get five nice community triggers and then the next one you add will try to kill the rest of them off. good luck