Ooof, I just looked at your avatar and see that you're in Central Florida. You're in a great spot to get FREE (at most cheap) rice husks. They're exceptionally lightweight, do not break down easily so they won't turn into a slip-slidey moldy mess, and is totally 'green' friendly. Lay an eight inch or higher bed in their coop and let the chicks/chickens do the work. You can add a sack of this material on top of the bedding if you think it's not getting turned enough. You shouldn't need to totally replace this bedding for a year or more, providing it's getting a daily 'toss' from your flock (or a rake). You help the rice farmer by hauling it away, and he helps your flock. Birds will gladly sift through every last husk in hopes of finding the rare, but occasional grain of rice to gobble up; and this helps turn the 'dirt' under, bringing the clean husks to the top.
