With Cocci, you don't always see blood. Sometimes, when you see blood in the stool, that means it's too late. I'd treat the flock with Corid, just to be safe.
ETA- The video's not working. Could you give us a link?
Here's the link. She's not moving around much, but I think that was because I took her out of the pin because the lighting was poor. When I put her back in, she immediately started eating.
Treat the flock with Corid. You can find it at your feed store she should be okay as long as you get the meds as soon as possible. They can decline fast though, so get it today or tomorrow if ou can.
We called and the feed store didn't have corid, but the guy said to get medicated feed and this electrolite thing that you put in their water, so we're picking that up tomorrow.