If you have 2 males they probably won't actually murder each other, but they'll fight to establish separate territories (where they can't see the other). Personally, I would take one male back and get a female. 1 male/ 2 females is a better combination. Are you sure you have 2 males? I really can't tell the difference when they're babies, because their colorations are about the same. I usually guess juvenile sexes by body shape, but then it is still just a guess.