I have a hen who is breathing hard and it sounds like she has crap in her lungs, like she accidently inhaled water or something, she is lethargic also. I have had a couple problems with Cocci before so I immediately treated with corid because it wont hurt if that's not the problem and if that is the problem the sooner the treatment the better. She doesn't have worms or mites or lice, she is on organic feed with choice grit and oyster shell, and probiotics/vitamins for layer hens if their water. They are in an enclosed coop and run with plenty of space and I clean out the coop every 2-3 weeks. I any ideas of what it could be or am I on track with the corid treatment? Also she has a soft squishy crop, but not sure if that's because she didn't eat much this afternoon from not feeling good? Or could this be a crop problem? if so how are those treated? I don't know what the deal is, I have had to treat my flock with corid several times the past few months, I don't know if the ground they are on is totally contaminated and they need to build up a super strong immune system or what?