Im having a pretty bad situation with two of my rats that are brothers and have never been separated. I just acquired a pair of 6 week old rats a female and male and have them in a completely different cage from my two boys. Now one of my boys has become extremely aggressive toward me and his brother. I have separated the two boys buy I don't want them separated for good. Would it help if I got the female spayed or the male nurtured or both to help fix the situation. Is there another option?