If it is Cocci, and your using Corrid, don't use any other vitamins or supplements because it will counteract the Corid. Corid is a Thiamin blocker, which is what feeds the intestinal parasite, so it essentially starves the parasite so it can't reproduce. Unfortunately, once the bloody stools appear, it can be too late. I learned this the hard way with my first batch of chicks a few months ago
Just keep them on the Corrid, cross your fingers, and hope for the best 
Just keep them on the Corrid, cross your fingers, and hope for the best 
. I was looking forward to pink eggs and seeing what kind of chicks I could grow. I'm very grateful for all of you. Without you guys I'd be very lost.