I have 6 2wk/old chicks (Ameraucana, RIR, and BR). I just got 3 day olds (Barnevelder roo, 2 Buff Orpingtons). I tried putting them in together and the older chicks were very aggressive, pecking at legs and beak. I have them separate now. I think the Barney could survive with the older ones but I was thinking of letting all of the younger chicks build strength for a couple of days before sending them back with the rowdy older ones. Am I being too protective or not enough?