I am in the process of raising a new flock of RIR's. We have 11 baby chicks that are all about 6 weeks old today. They have been on the Purena Start & Grow feed and all have been very well thus far. We do have an older hen who is about 10 months old, she is a survivor from a small flock that was actually stolen from our place, she is a free ranger and is only in the coop at night. The chicks have been introduced into the coop and everyone seems to be living happy. They've been in the coop for the last couple weeks. This morning when I went out to turn their light on I noticed that one of the chick has bloody poops. I am pretty familiar with the appearance of chick poo and this doesn't look good. Now that the chicks are up and moving around I believe I have determined the sick chick, she kind of just stands there as if she doesn't feel very well. Last time I checked she was perched up on their little, lower roost, while the others are all moving around eating! I've post two photos that I took this morning of the bloody poo. Any suggestions here would be greatly appreciated, I thought that perhaps I should give some probiotics but wasn't sure. Could this be a result of them pecking at cardboard within the coop, before letting them loose in the coop they were boxed into one corner so that they could get used to it first.