All my hens (16) seem to have started to have diarrhea. I was told to add one tablespoon of Cream of Tartar to a gallon of water. Is this an old wives tale or could it help? They are a little over 4 months old and not yet laying. Five RIR, eight Barred Rocks, and three Ameraucana (and one RIR/Ameraucana mix rooster). Any help would be appreciated.