Ultum Nature Systems Controsoil Made in Japan, Ultum Nature Systems Controsoil consists of high-quality natural soil and volcanic ash. Choosing a quality substrate is an essential part of a nature aquarium as it provides vital nutrients for lush plant growth and helps balance water properties by decreasing the hardness/pH for optimal levels for aquatic plants, shrimp, and most tropical fish. Its common for competing substrates to cause ammonia levels to spike. While this helps jump start a tank, it is toxic to livestock and can cause unsightly algae during initial stages of an aquarium set up. Controsoil provides the perfect level of nutrients without excess. Controsoil is available in various bag, granule sizes, and colors to accommodate user preference and aquatic plant choice. Our recommended substrate choice for beginners! Why we like UNS Controsoil: No rinsing required No excessive nutrient leeching Buffers water to slightly acidic pH for better nutrient consumption Suitable for all freshwater inhabitants Comes in 3 different granule sizes and two colors Provides optimal oxygen exchange and rich nutrients No rinsing required No excessive nutrient leeching Buffers water to slightly acidic pH for better nutrient consumption Suitable for all freshwater inhabitants Comes in 3 different granule sizes and two colors Provides optimal oxygen exchange and rich nutrients Designed For Planted Aquariums – Granule composition and sizes provide optimal oxygen exchange and rich nutrients for aquatic plants Optimal For Fish And Shrimp – Suitable for all freshwater inhabitants such as tropical fish and shrimp that prefer slightly acidic aquarium water Low Ammonia Release – Promotes and accelerates beneficial bacteria growth No Rinsing Required – Helps clarify and detoxify cloudy water by actively absorbing impurities pH & kH buffering – Buffers water to slightly acidic pH and lowers total water hardness for better aquatic plant nutrient consumption environment