We have four hens who are two years old. We have two new girls that just arrived 10 days ago. (They're about 12-14 weeks.) We built an an "apartment" for the new girls adjoining the coop. They are separated by wire and can see each other. I have let them all out at the same time and there's a little kerfuffle then the four go one way and the two another. Most of the time, I let them out separately. I'd like to be able to put all of them in the main coop because the apartment is a lot less secure. But I don't want the new girls murderously attacked. I've seen it in the past and don't want to see it again. Any advice as to how to proceed without (I hope) bloodshed?