I'm new to the chicken raising and i didn't realize that my chickens runny poop was a sign of Coccidiosis. I have 20 chicks and I noticed a one of my chick was standing away from the flock and acted very weak and lethargy. When I give food or treats she does not run to it. I though maybe she was just being pick on by the bigger chicks and been observing her. So last couple days I noticed she is really is not eating and just stands around, also one of my silkies seems a little stand offish and not as energetic. Can you please help, do I need to isolate the sick chick and treat her??