my coop is 8x8 too. 30 will go in there to sleep no problem. even more if you build you roosts stagered. i have about 60 chickens right now and have two coops, other one is 12x20, about half of them choose the smaller coop. just make sure they have a big yard with outside shade and you"ll see how little time they will spend in there. what do you want to know? i'm no expert but i have hatched chickens from eggs. we have 20 going into the incubator in the morning.