This black aquarium sand is ideal for creating interesting, contrasting underwater landscapes. Natural and safe: The aquarium gravel is 100% natural and completely safe to use in any type of fresh and saltwater aquaria. It does not decompose easily and will not pollute the water parameters.Decorative use: With the aquarium soil, you can create lush and vibrant underwater landscapes. The dark colour of the sand contrasts amazingly with the green plants and living organisms, making them look more colourful.Benefits: With rich trace elements, the aquarium gravel sand ensures good rooting and rapid growth as well as the attractive appearance of plants. The aquarium substrate also helps maintain water stability and prevents the accumulation of debris, ensuring a clean and healthy environment for both plants and aquatic inhabitants.