Pettex Roman Gravel is coated in a colourfast resin for easy, trouble-free aquarium keeping. It is also the perfect planting medium due to its fine size. Roman decorative aquarium gravel is the ideal way to enhance the appearance of your fish tank. Chosen from selected silicate aggregates known for their increased surface area, which allows for improved anaerobic activity. Suitable for bottom feeders and barbed fish. Makes the perfect planting medium due to its finer size.