Hi, I recently separated and treated a hen (she was very sick) with baytril squirted into her mouth. I also treated the rest of the flock for 7 days with baytril in their water as another hen was gurgling but not as bad. This was only a few months ago. I now have a gurgling hen again. Do I need to treat with baytril every time or will they get over it themselves. I also have 3 chicks at about 8 weeks or so old. Can I introduce these to the flock?