I have 1 - 6 month old silkie (hopefully hen) and 4 - 9week old pullets, do they have a natural instinct to lay eggs in the coup nesting boxes or do you have to teach them somehow? 2 of the pullets lay in the box at night, and the rest roost right now. Should I block off the box for now so they all roost?New to bringing up baby chicks. Thanks!