Hi everyone, I'm new to chickens and have only had my babies for a week. I've been visiting this site for advise and tips. I recently noticed some runny dark poop in their box. They all seem fine so I am not sure which chick is sick and keep watching but am still not sure so I have kept them all together. I'm thinking that probably wasn't the best idea. They will probably all get sick now. I'm going to go to the feed store in town and see if they have the meds I need tomorrow. Hopefully they'll be fine.
and Welcome To BYC! X2, if they seem normal otherwise and you are only seeing occasional dark poop, it could just be cecal poop, here is a nice chart like subhanalah mentioned of chicken poop, gives you an idea of what normal poo can look like 
