Originally Posted by AquaRick
aragonite sand is calcium carbonate based sand that will buffer the pH of your tank. It can come in a variety of grain sizes from CC to oolite/fine sand. It is not less or more porus than live sand. Live sand simply means the sand in question has been cured and is full of BB and other living organisms. I would think most if not all carribean sand is aragonite sand.
+1 agreed. Sand is just silica. That works for a bacteria bed but it packs much denser than aragonite does. Silica also is used for diatom production (not desirable). If you dive the real reef, you find a lot of aragonite as that is made by wave action and the gnawing of parrot fish on the reef itself. I prefer aragonite for all the reasons mentioned and my reef has been operating over 20 years.