I have 5 chicks hatching under a broody hen. At least one is fully hatched and fluffy. She chose her own nest in the coop and is alone in there - no other hens to pester her or chicks. But, it only just dawned on me that the chicks will never be able to get in and out of there. They could fall out and be killed. Can I move hen and chicks to the floor of the coop? Today is day 21, but one must have hatched overnite. How long should I wait before trying to relocate everyone to a safe level?