Yep thats what i meant by standing and pawing, that is "ive had enough" if it happens too much, one rat that is the "victim" will be stressed and when you go to handle her, she will be afraid of you cause she is scared at everything all around, are you sure they are females and you might want to seperate them for a bit or take them out together and play with them, if mine do that i pair them with someone else. It only makes for a stressed,freaked out rat in the long run and if not calmed down, will eat their pups. Save this now while you still can, been there done that too often. Also make sure when feeding there is enough for both, feed seperately but in same cage, in otherwords, don't throw a chunk of bread in there and make them chase eachother for it, your causing them to dispute. Let me know how it goes.