I got my first ever chix on Monday (3 of them) and went on Wednseday to get one more breed we wanted. It is so much smaller than the other ones and they started to peck at it right away. Right now I have the newest one (black silkie) in a box inside the pen with the other three. That way they are close but the black silkie is protected for awhile. Is this the best way to do this? How long should I keep the silkie seperated?