Hi there—newbie here with what may be a silly question. I've got two 3-week-old pullets (Barred Rock and an Easter Egger). We are getting our shipment of newly hatched chicks—two silkies—later this week. My question is, when and how can I go about putting them together? I know the babies will have more heat needs immediately, but does anyone have any experience with when it'd be appropriate to integrate them and how to safely do it? Thank you!