Hi everyone. I was given my moms 4 RIR hens (3 years old) over the summer to add to my existing flock, who were born this past Spring 2014. I did a 6 week quarantine, which went well, and they've been with my flock for 4 months. About a month ago, one of the RIR's (Ruby 1) got bright green diarrhea and was acting lethargic. I took her to the vet, and was told to give vitamins and worm for coccidia. I used Corid on the whole flock. The hen was still sick and was down to skin and bones. I gave her nutri-drench and scrambled eggs, and anything I could get her to eat. She stopped eating and passed away. A week later, another one of the older RIR's started the same symptoms(Ruby 2). I took her to the vet, and they gave her a b-12 injection. I was told its possibly a vitamin deficiency. They are on a 16% layer feed with free range twice a week. No treats. I dewormed the flock, including the sick hen with Safegaurd liquid to be sure it isn't worms, but she is still very sick. A third RIR (Ruby 3) has started the green diarrhea symptoms, but is still active. I'm at a loss since the local vet can't seem to help. The second hen is now extremely thin, and I doubt will make it through the night. She's wrapped in a towel on my lap as we speak. I feel terrible, and can't watch the 3rd hen go through this, like the first two. My younger chickens are all fine, as well as the 4th RIR (Ruby 4) from my mom. The symptoms start with runny green poo that sticks to their butt feathers. Loss of appetite with weight loss. Loss of balance and weakness. Fluffed feathers and sunk in head. Any advice is greatly appreciated.