Caribsea aragonite buffers to the highest ph and delivers more calcium carbonate and trace elements than any other substrater little or no rinsing required aragonite keeps aquariums healthier longerr caribsea aragamax select aragonite is sugar sized oolite ideal for reef or fish tank bottom cover it is the perfect substrate for african rift lake cichlids and reef tanksr caribsea aragonite buffers to the highest ph it helps to create a natural biological and mineral balance to discourag