I have 4 cockerels and 7 pullets; they are all 4 month old sizzle chicks. I have a 10 x 13 x 10 enclosed coop for them all. I allow them to have supervised free range 2-3x daily. At what age should I seperate the cockerels? I have another coop they can stay in at night and then free range during the day. Should I leave 1 of the cockerels in with the pullets for additional protection when they free range? Once I seperate them will they be able to still free range all together without fighting?