Not sure if I have a problem or not. I have a flock of 6 hens that are just over 6 months old and all are laying. One of the hens has prerty serious diarrhea. It is brown in color, no blood in it. She has had this for about a week and her rear feathers were getting pasty. We cleaned her feathers. Other than that she seems fine, no loss of appetite, plenty of energy, laying every day... Should we be worried? Is there something to do about the diarrhea? Any help is appreciated.