We have a young red star hed about 6 weeks or so. She has been fine but yesterday she started not being real active. She has orangish diarreah and is not eating. She is in with other chicks and we lost 2 young silkies that were in with her too. We are giving her Tylan so far. Any ideas on what this might be and what we can do to get her well? Thanks in advance for the help.