We have 5 day old chicks (4 sexlinks and 1 Sicilian buttercup). The Sicilian Buttercup, who was very alert with typical behaviour suddenly changed behaviour today. We have twice wiped poop off its back feathers to avoid pasty butt. Is drinking but not eating. We have seen one poop, but doesn't seem very healthy looking to me (dark brown with portion of red, picture attached, sitting on a shaving). Haven't had any experience with coccidia - could this be the culprit? If so, what steps to take?