One of my 4 week old chicks has some loose poops/ a dirty bottom. The only thing I can think of is coccidia. It has been wet and hot down here in SW Florida, and these guys get outside and under their juvy-coop a lot. I want to start this little lady on Corid, but should I treat all the other chicks? All of them act normal--eating and drinking well, no guys looking puffy yet. Thanks for your input.