hmm i don't see noticeable blood, but it's possible.
It's a good idea to have Corid on hand when you have a flock. http://www.amazon.com/gp/product/B00M1UPA6G?keywords=chicken%20medicine&qid=1448478467&ref_=sr_1_1&sr=8-1
It's much cheaper and readily available at farmer's coop or wherever farm supplies are sold.
Check out
http://www.the-chicken-chick.com/2012/12/coccidiosis-what-backyard-chicken.html
Also good/normal poo pics below. Watery cecal poos are always extremely stinky too me.
http://www.the-chicken-chick.com/2012/02/whats-sc
oop-on-chicken-poop-digestive.html
Look very closely at the picture and you'll see lots of mucus, which is not normal.
http://cdn.backyardchickens.com/6/63/639576ef_20151125_123555.jpeg
Zero risk in treating with Corid, so that's what I would do for sure.
-Kathy