The Quartz Gravel Slate Gray is a high-quality aquarium substrate designed to enhance the aesthetic appeal and biological performance of your saltwater or freshwater tank. It features iron oxide coloring that ensures long-lasting vibrant hues, providing a natural and attractive look for marine or reef environments. This gravel has a grain size of 1-2mm, making it ideal for bottom-dwelling fish and plants with delicate roots, while also creating an optimal environment for beneficial bacteria to settle and thrive.