I have a sick RIR roo. He is sneezing his little head off and when he crows he sounds horse and can't get his crows out. he is almost 30 weeks old. He is in a pen by himself. so I am not worried about the others getting sick. I have 2 different antibiotics duramycin-10 and tylan 50 I also have some vet rx which should I use on him and how much? he sounds pittiful when he crows and he is sneezing almost constantly, please any info would help . his crow sounds like he is about to lose his voice. this just started a couple of days ago.