The LFS is convinced that the MUD helps feed the SPS corals and does not require as much dosing, stabilizes the tank. So I started looking into it and doing some research and found many opinions on a deep sand bed, but not any real testimony on the results gained with MUD... the goal is not to reduce any levels of Nitrates, but rather have a consistent source for minerals for the corals in conjunction with dosing... When you read the manufacture claims it sounds too good to be true... But a LFS is swearing by it so I thought I would ask the experts.