I am new to posting...I have tried to read through pages of postings and am not sure if this has been answered. I have a hen, who has been healthy for 3 years. She now seems sleepy and lethargic and I noticed today her feces have become clear and runny like water. We have in total 11 hens(...had a rooster, but he got so mean, we invited him to Sunday dinner!). A light Brahma had seemed this way for a while...lethargic, stayed by herself, walked around like a 90 year old cowboy (no offense meant to 90 year old cowboys). She seems to be getting some energy back. I have laid off some of the "treats"...fruit peelings, kitchen scraps, etc, thinking maybe I have spoiled them into ill-health, but their egg-laying has dropped to almost none. I don't know if this is an isolated incident with the hen or is this something that could be going through the entire flock? I dust periodically for mites, have cleaned the coop, add cider vinegar to their water at every changing, they have free access to grit and oyster shell, they have access to a grassy run and I do feed a laying mash which has not changed in the two and a half years since we've had them. I do allow them to range in the back garden...I have potato plants and tomato plants growing there, but if those are toxic to them I figured they would know what they can and cannot eat and would leave them alone, which they seem to have done...they scratch at the base and eat bugs. Also, could NOT having a rooster with them discourage their egg laying? I have included all the info I can think of incase something might be of importance. What could be the problem and how can I help them? These will probably never be meat birds as we have them all named and the particular hen in question is my buddy...the friendliest of all of them...I would hate to lose her. Any takers?