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.