Ocean Free Aqua Gro soil and Shrimp Sand, is a substrate specially developed for aquatic plants and shrimps that need specific nutrients for growth. It is all natural and highly recommended for enthusiasts who want to grow their aquatic plants and shrimps well. Aqua Gro is produced using a special formulation which assists in lowering the PH and KH of the water in a short period of time and at the same time maintaining it. As a result, it creates a natural water environment suitable for the aquatic plants and shrimps. In addition this soil/sand produces great stabilizing qualities for the general well being and balance of your aquarium. In addition, the natural conditions created by Aqua gro Soil makes it suitable for most tropical fishes too.