I have a small cochin mom with 13 chicks. I have had the heat lamp on them since I got them, half are three weeks old and some are four. The chicks were supposed to be split up between two hens but one wasn't interesed. I don't think all of the chicks fit under her at the same time, should I keep the heat lamp on? I hate for her to have that light on all night long and I could really use the room for another broody hen who has been sitting for 5 weeks. I finally broke down today and bought her some chicks of her own because I can't keep her off the nest.