I have 3 silkies 11 weeks old, 3 silkies 8 weeks old and 3 red sex links 6 weeks old. It all started with one chick having a closed eye. Well, it's now progressed. All the chicks are sick to varying degrees and symptoms. The symptoms are: having a hard time getting breath, looks like they are gulping for air; wheezing, rumbley sounds when breathing; coughing; sneezing; gunk coming out of nostrils; one or both eyes closed; gunk on eyes sticking them shut; swollen and red eyes; a sour, acidy odor, which is the worse on the silkie that has the worse rumbling when she breathes and coughing. I noticed the first symptoms Saturday morning. I went and got Duramycin and put in their water. They just progressively have gotten worse. So today I went and got Tylan 200 and gave them their first injection. I think I'm going to go with the plan of 1/4 ml 2 x day since they are so sick. Is that the right thing to do? Also, while holding them to give them a shot, I noticed that on some, not all, their crop was puffy. Does this have to do with the infection? I'm also wondering if I stop the Duramycin in their water or keep doing that along with Tylan injections. Any help would be appreciated. I feel so helpless!