We switched to sand in one half of our porch brooder/coop. (the other half is wire) Well, my husband put it in a couple hours ago and they are still eating sand. They are 12 week old Orpington and Silkies. Will they be ok? I was a bit surprised because they free range for a couple hours a day and don't spend the whole time eating dirt... Just wanted to be sure we didn't make a mistake!