I've been trying to figure out what to do with the floor in our run when we build it. The coop will be 5 x 10 ft, 2 ft up of the ground. The run will be attached and roofed 10 x 10 ft plus the space under the coop. I've heard of people just letting the dirt be the floor and others throwing down wood shavings or sand. What do you recommend and why and the best way to keep it cleaned?