I was wondering if there are any users of either of these products, past or present. A couple of BNARC members use Zeovit and are having fantastic results with SPS color and growth. Maybe Bill will chime in here with his experience with Probidio (pardon me if I'm wrong but I believe you use this product?) I can only say that his reef tank is pretty amazing in color and a super healthy overall look. I'd like to know the differences between the two systems and where is the best place to begin or buy the product.