Aragonite is an all natural substrate for all reef aquarium, marine tropical. The grain size variable Pearl Beach makes this an ideal substrate for a variety of benthic organisms. To determine the number of bags needed for your aquarium, please calculate that each bag occupies a volume of 8,600 cm3. To determine the amount necessary to multiply the width of the tank by the length by desired depth. Unlike products "wet" marketed by our competition under the concept of living things contain, Pearl Beach is sold dried, sold and you pay only for the gravel and water unnecessary. These products indicate that contain live animals and microscopic when in fact contain only common bacteria. Dry or wet, there are bacteria on each substrate available. If one is concerned with shortening the cycling time of the tank to a new system, use a product designed for that particular purpose to be more appropriate (such as Seachem Stability).