I'm not sure that this particularly goes under "Flock Management" but it's the closest I could think of. For the first year and a half of owning chickens my chickens were fine. I had one die of worms but that was just because I didn't know what was wrong with her and thought she was just vitamin deficient. Anyway the past two and a half years my flock has been hit repeatedly with illnesses one after the other. First it was a mysterious disease that killed three of our best layers. Then Marek's (possible mysterious disease) killed our beloved rooster. Another rooster just died out of the blue (suspected hate crime) I might add one of the prettiest roosters I've ever seen or raised. Then after that I had to kill about six other hens who were showing signs of illness. Now, I have what appears to be infectious corzya running through my flock. A hen decided to set, and about mid way through she started getting all these bumps on her and then her eyes swelled shut, then the chick, which hatched out fine, started getting these boil looking things on her beak, which migrated to her eye, which swelled shut, and now it is migrating to her other eye. At first I thought maybe it was just mites, since mites can cause little scabs on the crowns of chickens. I dusted everyone and a few of the hens appear to be getting better but the ones who are really sick don't seem to be improving. On top of that I found wormy poop the other day, so I wormed everyone. Now, everyone is on Sulmet for the treatment of corzya. Am I the only one having serious issues with chickens? Am I doing something wrong? They always have clean fresh water, the nest boxes are always clean, the coop itself I sweep every week! They have fresh clean food daily. I've cloroxed my coop probably 4 times since all of this started. I'm at the point where I just want to get out of this whole chicken hobby thing!