Fighting in my rat colony

Question
There has been a lot of little quarrels and bullying going on in my rat colony lately. I think my rats might all be fighting for dominant position but im not sure. Could you read my story below and tell me what you think?
Ok, so...
I had a cage of 5 female rats, 3 adults (Salena, Denali, Minca) and two of Salena's 2 1/2 month old daughters (Kayla, Sassy). Five days ago I introduced a 6th rat, a 5 week old baby girl named Fauna. Salena I believe is the dominant girl, and she was really beating up on poor Fauna for a while. No injuries besides a little nick now and then, but Fauna squeeks a lot during the bullying (long lasting, hight pitch squeeks). Now, suddenly all the girls seem to be getting in little fights. Kayla (one of Salena's daughters) seems to be dominating the other girls now, especially Salena, who was always top rat. They also all seem to be bullying Sassy, the other daughter. Fauna is still so young I'm afraid she could get hurt in all the comotion. No serious injuries on any of the girls yet, but the fights look really violent and there's lots of squeeking (not like play fighting). Denali is the only one who seems to be staying out of the fights. I think Kayla might be fighting for top rat, because she never use to bully Fauna at all but now she is. Could it all be a dominance struggle? What do you think i should do? I'm afraid to not watch them because of all the little fights going on.

I also have a cage of four boys next to the girls. They are Salena's four sons. They always got along with eachother just fine but lately their fights are starting to get pretty serious too. Lots of back leg kicking, boxing, squeeling, and teeth baring, though no injuries so far. Do you think being so close to the opposite sex is causing all the fighting? I've never had this problem before.

Answer
You could most certainly try putting the boys and girls in separate rooms to see if its the close proximity; but honestly I think they've just all hit puberty. Naturally, those coming into their own are going to begin to argue for the top position. I'd say as long as you don't see any chunks of fur missing (or goodness help them, blood!) you're probably okay and they will work it out. Remember the rule with rats is No Blood, No Foul. Often times, the more we intervene, the more we bother the natural order.