I have 32 6 week old mixed gender chicks in my hen house and run (no older birds). One golden campine pullet has a bloated crop. Everyone else is doing fine. Her crop was swollen two days ago so I put apple cider vinegar in their water and put her in isolation. Her poo is basically normal (a little bit less than solid but not diarrhea). Shes eating and drinking normally and is a good weight. When I checked her this afternoon her crop was even bigger than yesterday. I felt it and it feels like its full of air. I massaged her a little and she burped up air. It didn't smell bad. She shook her head then went back to protesting being held. She doesn't seem to be in any discomfort. I'm not sure what to do. Is it sour crop? blockage? shes eating/drinking/pooing OK. Ideas?