I recieved my chicks today, 4 RIR's and 4 Buff Orps. All look great except for one of the Buff Orps. He seems to be eating and drinking fine but has excess poop around his rear (vent?). I have seen him poop so he can go but he has been doing a lot of picking and pecking back there. As a precaution, I dunked his bottom in some warm water and gently cleaned the area. Should I have any concerns? Any suggestions?