Aquarium SPS Sea Salt for Saltwater / Marine / Fish only or Reef Tank 6.7 kg by Blue Treasure Trusted seller since 2007 If you will order 2 or more, one piece per order number please. Note: "Fish only" means saltwater/marine aquarium with no corals or fish-only-with-live-rock (fowlr). This SPS salt is suitable for both reef tanks and fowlr. You can normally use lower specific gravity/salinity for fish only salt water aquariums. Higher salinity is recommended for marine tanks with invertebrates such as corals. Blue Treasure SPS (Hard Coral) Sea Salt is further purified based on Blue Treasure LPS Sea Salt. The new formula of Blue Treasure SPS (Hard Coral) Sea Salt is specially developed for the growth and breeding of SPS corals. Specially formulated with SPS coral required levels of calcium (Ca), magnesium(Mg), strontium(Sr) and other essential trace elements of natural sea water. Also, more Ca, Mg, K and other trace minerals are included as required in keeping and breeding SPS corals. The raw materials of SPS Sea Salt are selected from pure food grade materials and contain all kinds of trace elements which are found in natural seawater, as well as some other special vitamins and protective colloids. The sodium chloride (NaCl) of Blue Treasure Salt is purified from pure, non-pollution underground brine. In addition to this, the Blue Treasure Sea Salt are formulated after many experts research of Ocean University of China, since 1996. If you have question(s) about the product please message us before ordering. Please be sure of your order as item cannot be returned or exchanged due to mistake in order, change of mind, etc.