I recently introduced my 25 girls to the ''big house''....still with a heat lamp of course.... I was afraid they might try to ''roost'' in the nesting boxes , so I covered them with a sheet of cardboard, till they are old enough to use them?? Did I do right?? I though I read to do this once? Do I need to let them 'experience' the nest boxes at 3 weeks of age?? For practice? When should I let them have access to them? I dont want them to sleep in them. But I dont want them layin on the floor either?? Right now they are sleeping under the heat lamp and up on the shorter roost we made for them. Any advice on this would be appreciated!! Thanks!!