I read where feeding your flock diatomaceous earth is very beneficial not only for shell production but for keeping down the smell and fly population. Does anybody feed this to their hens? My hens are 10 weeks old, are they old enough to add this to their food? I worry about the smell because I do have my hens in a suburban backyard and I don't want to give my neighbors anything to complain about, especially since I also have two roos, which I would love to keep. I am totally legal in my community, but if neighbors start complaining about them being a nuisance, I would have problems. If anyone knows anything else that helps keep the smell down, please let me know what works for you.