...it was just the one time - i've been hovering over them all morning and haven't seen any more. Nobody's acting any differently. I checked everyone's vents and couldn't find any traces of blood. My flock ranges from 4-7weeks old and are on Purina medicated starter. So, does cocci cause ongoing bloody stool, or just every now and then? Is it probably cocci even if none of my chicks look sick? If it isn't cocci, will treatment be bad for them? Probably ought to start up chicken medicine box, huh?