Yesterday I brought home 5 new chicks, two of which were about 3 weeks old already. One of the 3 week olds (Barred Rock) is pooping kind of dark, gummy poop. It's maybe reddish or orangish brown and a little more wet than a peanut butter texture, I guess. Not watery and no color seperations- all solid color. Other than that she (maybe a she?) seems fine, maybe a little bit more lethargic than the other 3 week old, but still gets up and walks around and eats, etc. Should I seperate her, or even all 5 I got that day? What should I do? Thanks in advance for any advice!