Thank you, Tom, waiting until they are mature seems like a good idea to me too. Good to know yours were so accepting. I like the idea of putting them in there at night when they are all settled in.
Since the age of the chicks is staggered over a weeks time, maybe I will put a few of the oldest ones in first and see how it goes. Ha!
Two of my grandsons are coming after Christmas and that will put some of the chicks right at eight weeks, possibly a good time to do it. The boys (13 & 14) will probably like the experience.