I have been reading that a lot of folks say that Silkies don't roost - they like to sleep in the nest boxes. Which equals poopy nest boxes I assume. I will soon have a mix of Silkies and a few other types - should I plan some kind of extra "bed" space for the Silkies? How do you keep them from sleeping in the nest boxes? Will they roost if you set up very low roosts? Like 6" off the floor of the coop?