I have 11 nearly year old hens. One is having diarrhea with a lot of liquid and what look like (but of course aren't) wormy, dark, mushy stools. She has been doing this for 3 days. Also, I have just noticed that all the hens but one have gotten pale pink combs and wattles, as opposed to the bright red they had just a few days ago. Egg production is also down by about a third. I have tried the book on chicken ailments but can find nothing that addresses these issues that make any sense to me! Does anyone have any idea what is happening to my flock? I feel I need to do something because both issues seem like distress signals I can't understand. Any help would be appreciated!