I have about 55 or 60 different chickens, several types, in 6 pens. Have never had coccidiosis that I know of, but read about it showing up, on several of the chicken lists. They are treating with Sulmet. My question--should I dose with Sulmet as a preventative?? If so, how often, how long, how much? And, everyone has pretty well quit laying. My main pen (22 standard hens) have been molting for a couple months and not laying AT ALL, but have now grown in pretty feathers, but still no eggs. ??? I am getting a little irritated, as feed isn't cheap. Anything I can do to sort of bring them back to laying? They are mostly Americanas, EE's, & 3 Marans. They are 2 years old.