I recently posted a question regarding what turned out to be hemorrhagic septicemia. I researched the disease further and found that it can be self-limiting if water parameters are corrected etc.As per suggestions from this forum I ordered an antibiotic that is gram positive and gram negative. It of course requires the use of a hospital tank. Since then the Tang is not showing any signs of worsening (in fact he seems somewhat better--less blotches) I have since found a product called "melafix" sold by Foster-Smith and recommended for this disease. It is an all natural product and supposedly reef safe. I would prefer this type of treatment that can be done in my main tank rather than stressing the fish by chasing him and putting him in a 20 gallon tank. Anyone have any experience with this product?