Aqua Natural Diamond Black Betta World Gravel is great for aquatic plants. This not only looks wonderful but has also been shown to help reduce the build-up of algae in the aquarium. This is partly due to the huge surface area of quartz which offers added space for the establishment of tank cleaning bacteria. Quartz sparkles underwater due to the many lights reflecting facets and looks like diamonds have been added to your tank. It is pH neutral and aquarium safe. It can also be used in pot plants, fountains and candle holders, just about anywhere.