Red Sea Blue Salt 200g MixProvides the parameters of NSW with a slightly elevated KH. Ideal for SPS Dominant, UNLS & Marine Fish tanks Red Sea Salt is designed to provide the exact parameters of tropical reef water with a slightly elevated alkalinity as needed in a closed marine system. Red Sea salt is ideal for fish and invertebrate systems or for low nutrient tanks where the hobbyist supplements all of the individual elements on a regular basis. All natural Eco friendly