Ok so here's what is going on and I really hope and pray someone can help me. This all started with my rooster 2 days ago now I am finding something similar with one of my hens. The other day I found my RIR rooster is losing feather, acting lethargic, had watery eyes and had gurgling noises when was breathing so I removed him from the flock and inspected him for mites and the like and did not see anything and started him on some Tetracycline twice a day. Surprisingly, he is still with us but still seperated. This morning I went out to the coop to feed my six hens and clean the coop, One of my buff orpingtons did not come off the roost and when I pet on her I discovered that she is kind of sneezing but the end of the sneeze is a gurgling kind of noise. Her eyes seem fine but I am really worried that she has what my rooster has and if she has it then the rest of my flock may get it too. I have a total of 6 hens and a rooster. I have read other things about Tylan 50 but what I found at Tractor Supply is for cattle, is that the same thing? Like the others I am not entirely comfortable giving injections and I am not confident I can catch each one of my chickens to give injections. Is there something I can put in their water that is just as effective? I do treat my coop with DE food grade when I change the bedding and scrub the coop about once a month to prevent mites and other crawleys and the last time I did that was 3 weeks ago. Any help would be greatly appreciated.