OK, so my 6 females have been together for the last 6 weeks and all is well in that department. I have taken the remaining 2 neutered boys and am doing intro's in case they end up separated by an adoption or don't get adopted at all and end up staying here. For the past 2 nights we have placed all in the tub and then on the bathroom floor. Watermelon who was my original "pin" rattie was been pushed out of king pin and Luna has taken over. The 2 cages have been side by side for the past week. For the past 2 nights we have put everyone in the tub which really works out well. From the tub they go onto the bathroom floor where all the trouble is taking place. The 1st night Luna was pinning Tolberone and Tolberone only. The second night she was pinning Little King and Little King only, but Gaddy took over the pinning of Tolberone. Luna is pinning but she is also "nibbling" on the bellies as she huffs. Her body is puffed out as well, something Watermelon never did. Is this something I should be worried about? and should I let it go on? at what point do we step in. When little King continued to squeal, Jill went to take Luna off him and she turned and tried to bite her. Is this also normal behaviour? The next time we put them all together, I am going to try and video tape it so people can see exactly what is going on.