I'm trying to plan which type of hens to get (as day olds) when I start my flock. I'd like standard Ameraucana/Easter Egger, Brahma, Cochin, Buff Orphington, but I'd also like to get bantam Silkie and Mille Fleur. My question is, in a smaller run is there any harm with mixing sizes of hens? I know they'll determine the pecking order, but I'd like to keep the flock happy starting out too. Also, I read that Ameraucana's are about 4.5 lbs where Brahmas are 9lbs. Any concerns there?