Salt - 160 gal (Box)Red Sea Salt is the ideal mix for fish, invertebrates, soft corals, and low nutrient SPS reef aquariums. Red Sea Salt is created by blending natural solar evaporated salt (NaCl) harvested from the waters of the exotic Red Sea Reef together with other fine elements resulting in a well balanced salt mix that is as close to real reef water as possible. 72% of the salt comes from the Red Sea and the other 28% is composed of major, minor and trace