I have three chicks that are 5 1/2 weeks old. Two a silkies and I have no idea which is their fluff and which is their feathers. The other is a mystery chick that is fully feathered except for her head, still all fluff from the "shoulders" up. We are getting down to the lower 60's at night. They've been in my garage, which doesn't get lower than 80. Can they go out to the coop at night yet?