I would roll the aggressive one or both to the ground and make them stay on their side till it calms down you the pack leader make the rules and have to enforce them just like wolves that's what Caesar Milan does to control a pack of 30+ mostly pit bulls they do respect the pack leader's wishes but you have to win every time if you can't then you may have to get a trainer to help. Daily rub downs holding them on there side saying the word settle till they give in and settle are easy and you can use the word later to make them submit on command when you need to break up a fight, cut their nails, grooming or anything they will listen if your consistent.