The chicks I got are 4 weeks old and were on Purina's medicated chick starter, and that's honestly all you can really get around here. I'd like to wean them off it though and onto a non-medicated chick feed, but I don't want to cause them to get sick if they're relying on the meds in the feed to maintain a resistance to the cocci bacteria. Would it be safe to switch them in another month or so to something that's not medicated? I change their bedding daily but they're chickens - they walk in their own poop, and unless I put a grate into their pen they're going to be getting exposed to the bacteria. If I do switch, would this one be ok? http://www.countrysideorganics.com/product.php?productid=336&cat=51&page=1 Thanks!