A friend asked if we'd take her 6 RIR that came from the same source we got our chicks. Same age, same shipping batch, same feed, different treats, she vaccinated against coccodia I did not. She has other chicks as well, just realized she'd taken on too much. My 15 chicks have been in the coop for several days, are used to the MHP cave setup, and handle the Alaska cold well. Her (now 5) chicks are definitely heating lamp products (we added one to help them through this cold snap) which is fine, aren't very social (also fine, we've hand fed a lot of treats etc.), and seem stand-offish (expected after being lugged across town and introduced to a new flock... right?). The new chicks have been with us since mid-day Thursday.
There was bloody poop in the coop. I thought I saw it last night, but the lighting was poor so I brushed it off. However, in the sunlight, it was confirmed. I only saw the one. No traces of red in the straw or elsewhere. All 15 of mine are acting totally normal, the 5 newbs are acting more normal than they have been. I'm not sure what to do from this point. Help?!?!