Well, last night Tubby and Peanut got into it...at about 2:30 am. I'm usually sound asleep when this happens, so I really don't know what sets it off, but the screeching begins and the fur flies - literally. This doesn't happen too often, and I'm pretty sure it usually has something to do with the cats or other critters that might be outside, but sometimes I think Tubby just gets an attitude and takes it out on poor Peanut.

My point in posting this here is that even after about 13 years together, my two still aren't best buddies and sometimes don't get along at all. So, toughcookie, if I were you, I wouldn't even consider getting rid of your little girls because you don't think Muffin is taking to them. They are still getting to know each other and define boundries, so there are bound to be some scraps here and there. A gate is probably a good idea to keep them separated while you can't be there, at least until the little ones get big enough to defend themselves.

Good luck, but I don't think you really need to worry. Just normal kitty antics.