I just got some chickens about a 6 weeks ago. I have a pair of Delawares that are about 5 months old. Also have 2 black copper maran pullets and a buff orpington pullet that are about 4 months old. They all seemed fine at first but the buff and Delaware pullets began looking poor. Standing around with their eyes closed,feathers ruffled. They still ate and drank well.Then the yellow, foamy poop started. I treated all with Corid for 5 days. After that I gave them all yogurt and wormed them. I clean their house and run everyday. I give them fresh water and clean their feeder everyday. The poop went back to normal for a while but the 2 sick birds still didn't act right. Now the yellow poop has returned but they still eat like crazy. I just started them on poultry cell. Also the Delaware pullet has sneezing fits and the buff has a knot on the side of her face with a watery eye.What should I do? I heard if it was coccidiosis they would either be dead or recovering after 8 or 9 days. This has been going on much longer than that. Any help would greatly appreciated .