I have 4 3-year olds in a 4'x8' chicken tractor with an upstairs loft. I got them all at once as started pullets and they get along fine. They are Red Star. I would like to add two more. Yes, I have read the threads and know the "right way" to do it. But I don't have the wherewithal to do that. What is the worst that happens if I get two more started pullets of the same kind and just dump them in there? In the extreme, I guess I can just "eliminate" the old ones and get 4 new ones, but I don't really want to do that. Would it make a difference of which breed I introduced? I was thinking about getting a couple of Barred Rocks, but I certainly don't want to start a race riot!