I have been changing out the paper towels in their pen every day, but they are still getting dried poo stuck to their feet. A couple of them have had problems walking well or have been holding their feet up. I tried running warm water over their feet to soften it and remove it, with some success, but can't seem to get it all off. I'm afraid I will hurt them or, if the poo is left on, it will harm the development of their feet. These are the first tiny chicks I've had. My other five were already laying when I got them and I didn't have this problem. Any suggestions?