Seaflor Super Reef Sand 0.5 - 2.5mm diameter grain. This mixed grade (of Seaflor Special Grade and small shells) is also ideal for nitrate reducing systems or simply as reef tank bottom cover. The addition of small shells makes this an ideal substrate for tanks with mature jawfish, or burrowing inverts.
CaribSea Aragonite buffers to the highest pH and delivers more calcium, carbonate, and trace elements than any other substrate. Little or no rinsing required, aragonite keeps aquariums healthier, longer.