I treated my hens w/safeguard then Corid. Only 1of 6 hens was showing signs of cocci but kno all had it. I've since administered the 3 day vitamin reg. and yogurt. Everyone looks great. Eating and drinking normal but they are not gaining any weight and even looks like they may still be loosing weight! They are all laying normal. Several have runny stool but could be the heat. Am very concerned. Any suggestions?