From what I've read most people use "instant ocean" salt. I am going to use RO/DI water and a good salt. My questions are: Should I use the "instant ocean" or "reef crystals"? Is that all I need to add to the water? I am just setting up my first salt water, 75G w/overflow and 30G sump, and it will be a reef with few fish. I haven't desided what type of corals and "stuff" yet but have bought lighting that should accomadate almost anything. I also plan on a deep sand bed, 100% aragonite.