Did you find out anything about the moldy food possibility? I have posted about a similar problem with my almost-1-year-old Marans roo. He is perky, eating, drinking, etc., but feet are curled up. He scoots around on them a little bit, but basically just rests on his hocks....It has been raining like crazy around here, so moldy stuff is definitely a possibility for us. I've also found that Marans tend to "play in their water", so the coop seems to stay moist a lot, and I haven't been able to get it cleaned-out lately due to all the rain....Yikes!