I have a pair of Wyoming white clowns that are paired and stay on 1 side of my tank at all times. I introduced a pair of Nearly Naked clowns and they wanted to be friends with the Whites but the whites were not having it. Especially the male, he was super protective of the female and would chase them all over if they even came close to their side of tank. After a week they gave up and let the naked come over whenever they want to. After a few nights of friendly sleeping together the naked went to the other side of tank and now host that side. So i have 2 sets of clowns that fought at first, then had no issue and now house both sides of my tank.