Hi This is my first post. I have been raising a small flock of chickens since mid March when I got 6 chicks from Tractor supply. I've learned a lot here and from some friends. I have a nice coop that I built with 3 nesting boxes and a 12 X 12 attached pen. My chickens are Rhode Island reds and Barred rocks. They have been doing very well until a few days ago. My biggest red stopped laying eggs about 4 days ago. I wasn't sure which one it was but 2 days ago she became disoriented and lethargic. She was still eating and drinking water yesterday, but I knew that something was wrong. she was distant from the other chickens this morning, wouldn't get up and her comb was leaned over. She developed yellow runny diarrhea yesterday. I put her in an isolated coop and tried to give her some bread and water. she had a spasm of some kind and died at that time. Sorry this is so lengthy. Did I do something wrong? I purchased wormer for the rest of the flock today. They all seem okay. I clean their coop regularly and change their water every 2 days.