i have 2 buff orp. pullet chicks and they are about the size of my porcelain d'uccle bantams that are 6 months old. and my one and only cornish x rock chick who is way bigger than my pocelain d'uccle bantams. so when to put in with the older ones? "i have others in the flock with the bantams includeing, EEs, mutts, buff orps, RIRs, black sex link, and some barred rocks." so do you think it would be safe to just put the chicks in with the older chickens in over night and then put back in there cage befor it gets light out again? i wanted to start training them to go in the coop at night. thanks!