We have our coop in a previously fenced in area of our yard but there's no grass. It's just a dirt floor. The coop itself is above the ground so it's just in the run area. It has good drainage but having a dirt floor does get messy sometimes. What's the best thing to cover it with? I see a lot of people recommend sand and pebbles, but how easy is that to clean? Do I just change it once a year and rely on the scratching to keep it stirred up? This is our first time with chickens so any extra insight would be helpful. Thanks!