Good Evening All, I have a split level coop; the top level has a"loft" that has wire flooring where the nest boxes are and the bottom level sits on the ground. The part that sits on the ground is what I want to ask you all about.... At the moment my chicks are one week old and I put them in the coop during the day to play. They are only on the bottom level and that level (as it sits directly on the ground) has a gravel floor. Now, I know they will need an area to dust bath in and I do have a box that I was going to put down with old grass clippings, dirt, etc; but do I need to clear an area that has gravel as well? I would prefer not to clear the gravel, but will walking on gravel all the time hurt the girls eventually? My second ? is about DE - do I HAVE to use food grade DE or can I use pool DE? If yes to the food grade DE - why? Thanks!