Hi, totally new here. I've been lurking reading all the posts and getting GREAT info, thanks! I havea question though and hope y'all can help. I have 10 assorted "hopefully" pullets in the brooder. They range in age from 3 weeks to 6 weeks so they vary in size. If I start the older ones out in the coop how do I transition them from the heat of the brooder to the relative cold of the coop? Should I put a heat lamp in the coop? I need to keep the heat lamp on the youngers for awhile still.