The Premium Substrate For The Planted Aquarium Providing Essential Nutrient To Plant Root Structure Long Term For Success Planted Aquariums;Specially Fracted, Stable Porous Clay Gravel For The Natural Planted Aquarium;Its appearance is best suited to planted aquaria, but may be used in any aquarium environment;Never Needs Replacement And Remains Effective For The Life Of The Aquarium;Not Chemically Coated Or Treated And Will Not Alter The Ph Of The Water