I never saw bloody poop in mine, but I treated with Corid as soon as I noticed symptoms, she was better by the next day and 100% (acting) by the day after. I would treat for cocci. We just had one that was acting sick, but I treated all of them. I hope that solves your issues - it's so hard to know what's wrong with them, but that might be a starting point. Can you have a fecal float done in the mean time?