The Hugo Natural Gravel 15kg Medium (3-4mm) is a high-quality aquarium substrate suitable for various aquatic environments, including cold water and tropical setups. With a medium grain size of approximately 3-4mm, this gravel provides an excellent rooting medium for live plants, promoting healthy growth and stability. A mix of many different colours and shapes, this gravel brings diversity to your aquarium and has a very good blending effect. Its natural appearance enhances the aesthetic appeal of your aquarium, creating a riverbed-like environment that makes fish feel at home. Before adding the gravel to your tank, it's recommended to rinse it thoroughly to remove any dust particles. This preparation ensures a clean and safe environment for your aquatic life.