My girls have had diarrhea for 2 days. There is no evidence of blood or worms. Some stools have some mass but others are completely liquid, usually a tan color. Everyone is eating, drinking and acting normal. They all run up and want treats whenever I enter the coop. The girls are 8 1/2 weeks and have been in their big girl coop for 3 weeks. The run is sand and is cleaned nightly for droppings and old food. Right now, the girls are getting some steel cracked oatmeal (not cooked) and organic leafy greens in addition to their medicated chick feed. I put a tablespoon of raw apple cider vinegar in their gallon waterer daily. The weather has been moderate except it has been overcast this week (live on the coast of California). What could be the reason for this? What can I do whether it be medicine or food remedies to help rectify this? Any help is greatly appreciated.