So I've decided to start up a sorority again after a failed, horrible, miserable attempt. I had a hitman female in there who would kill the other girls in a single hit. Anyway, with her out of the tank all has been calm, kinda. I only had two females left by the end of it all. So my question is, when introducing new females, do you have to remove the existing females, change the decorations around, and then reintroduce them all together? What's the best way? And how would I introduce new females after having 10 existing females already in the tank? Do I have to remove all of them?