My 10 week old chickens have been sneezing ever since they were day old chicks. Now, I've noticed it much more and their poop appears to be green and liquidy. Today one of my EEs was very lethargic until I stirred everybody up. She still just wanted to sit and rest. I started them all on medicated feed when they were chicks. What do you think this could be symptoms of? What kind of medications or supplements do they need? Thanks