Iam on this for the same reason, bare bellies! No piles of feathers like molting, no swelling, shiny feathers everywhere else, bright red wattles and laying eggs. I will do the mite test. We had loads of sterlings last summer that brought red mites. I was told by a poultry vet to put Vaseline on the legs, the mites hide in the scales if their legs vasaline suffocated the mites. Still had to bath them and sterilize the entire coop. But even then they looked horrible, pale and dull feathers. These girls look terrific until you pick them up and flip them over. Frustrating!