Roman decorative aquarium gravel is the ideal way to enhance the appearance of your fish tank. Chosen from selected silicate aggregates known for their inert properties in a choice of natural stones or coated in a colorfast resin for trouble free fish keeping. Suitable for all types of aquarium set-ups including coldwater, tropical and saltwater. Roman decorative aquarium gravel is also the perfect planting medium due to its finer size. Increased surface area allows for improved anaerobic activity. Will not change the PH of the water.