This is a pretty popular subject on this board. Anyone (mod?) willing to create an official salt thread? There are so many salts and yet I've never seen them all compared pros and cons. There's Kent, IO, Reef Crystals, Oceanic, Red Sea, Coralife, Tropic Marin, and more that I can't recall. Some cost more, or require additives such as calcium. Some have more trace elements, and some are considered better for fish only aquariums or reef aquariums. It is very confusing.