The nesting boxes I'm building are designed as a three story unit w/ two flats per floor. As it is currently configured there are no dividers between the flats on each floor (or, there are no stalls in the bathrooms, so to speak). Now I'm stealing the dish pan method (I saw posted by another western NYer) so the chickens do have individual boxes with little 5 inch walls all around them, it's just that they can watch the gal in the stall next to them push and strain and grunt and, well... you get the picture. Do I need to intall a divider? The flats will be dark either way, by the way. Thanks in advance!