Okay so I've been trying and trying to introduce 2 new boys to my mischief. Out of my 4 existing rats, 3 have taken to the new boys and are already getting along. The problem is my alpha male Pepe. I've tried scent swapping, carrier method, tub intros, and no matter how long or how slow I take it, the moment he gets to interact face to face with them he goes for blood, and tonight he finally got it. He and one of the new boys started fighting and Pepe managed to bite him on the back hard enough to leave a puncture wound, and the boy (Saxon) slashed Pepe's face open. I have washed both boys' wounds with saline and applied silver solution. I just feel like I'm at a dead end though :/ if I can't get Pepe to accept the new boys then I have to return them to the rescue and I can't get any more rats unless I get spayed females. Is neutering my only hope, or will that not even help for sure?