I have a Black Australorp, a Ancona, and a Buff Orpington all at 7 weeks of age and they are in the coop. 2 days ago I got a Brown Red Ameraucana and a Silverlaced Polish, both 5 days of age. I was wondering when I should put them in with the older chicks. The lady at Sunny Farms said when their fully feathered but I'm posting just to make sure. Someone help!