We have a 16 X 8 run attached to our coop. When we built it in '09 we put sand down for the ground cover. Over time, it got nasty, of course, working into the dirt, with rain, poo, etc. So then we put down some "hatite" (similar to pea gravel, much lighter) over the top that we had left over from a landscaping redo. The girls have scattered that everywhere and we're back to a big mess. I need some suggestions on what we can use. I read that some people use gravel with sand on top. What do you guys think? If that's the case, I have some serious work to do, digging out the mess that's there and replacing. But I'd like something that will last longer and won't have to be reworked all the time. Suggestions, please?