Designed to provide a complete nutrient supply for long-term use in planted aquariums, this high-contrast substrate offers a bio-filtering function for enhanced microbial colonization. Create a mesmerizing aquatic display with the deep black tones of Eonian Black substrate. Inspired by the nutrient-rich soils found in tropical areas, this substrate is ideal for recreating habitats such as the Amazonian rivers or the swamps of Southeast Asia. The porous volcanic substrate of Eonian Black provides a stable base for aquatic plants to grow and thrive, while also supplying them with all the necessary macro and microelements for long-term growth and beauty. In addition to its nutrient-rich composition, Eonian Black also offers a bio-filtering function that enhances microbial colonization, reducing the buildup of harmful substances and promoting a healthy ecosystem. This not only benefits your aquatic plants, but also your fish and other aquatic animals, providing them with a safe and natural environment to thrive in. – 100% natural engineered volcanic substrate with active bio-filtering function – Optimal substrate ready-to-use for aquatic flora – Provides complete nutrient supply of macro and microelements for plants – Comes in 2 grain sizes, normal and fine grain. – Clearwater without discolouring effect – Designed for any water depth, including deep public aquariums – Extreme long-term use of +10 years. Does not crumble in the long run. Nutrients: Nitrogen, Phosphorus, Potassium, Iron, Calcium, Magnesium, Sodium, Zinc, Boron, Copper, Nickel, Chromium, Selenium, Manganese, Molybdenum, Cobalt, Fluorine, Iodine, Vanadium, etc. Grain Size – 2-5mm