I have a 5 week old bantam ameraucana chick that is puffed up and weak. I've isolated her from her brooder mates, but she's rapidly deteriorating. She had clear runny-white poo underneath her this morning, and she will not eat or drink. All other brooder mates are as active as ever. They are on organic chick starter, which is not medicated. They have not had any treats at all, except to run around in the yard for a couple hours a day. So basically my question is this: Can this be cocci? I thought if it was, more chicks would be affected, AND there would be bloody poo. I can get Corid and treat the rest, but I just want to know what I'm treating. Thank you for any help.