Hi, All - I'm new to this. I just finished building a nice coop inside of a 3-sided horse loafing barn. I am now finishing the run area in front - It measures about 20'x'14'. The ground is a combination of concrete chunks running down the middle and dirt toward the outsides. The concrete chunks were from a broken up driveway and they were put there years ago, so I didn't feel the need (or energy) to remove them. There's some loose dirt over the chunks (they're set together so there's a fairly flat surface). My question is, do I need to bring in a load of anything to put over the concrete and dirt? Or is it fine the way it is? I think I had heard about pea gravel, but I want to make sure I do it right the first time. The run extends to just within the roofline of the barn, so I don't think I need a roof on the run, just some wire to keep predators out. Thanks!