Meridian Oolitic Aragonite Substrate - 19.8 lb. ASM3406
Description: ASM3406 This aquarium substrate has fairly uniform 1/4 to 1/2 mm spherical or egg-shaped grains for reef and marine aquaria. The grains are aragonite; a naturally occurring calcium carbonate material made in the shells of many marine organisms. It has a superior buffering capacity to keep pH stable in a range suitable for most marine aquariums. Gravel and substrate color may differ or vary due to your computer monitor's resolution.