The Hawaiian Black Arag-Alive! Live Reef Sand is a unique and striking substrate for saltwater aquariums that offers an almost entirely black hue, creating a dramatic contrast with the vibrant colors of fish and coral. This live sand not only enhances the aesthetic appeal of your reef tank but also provides essential benefits such as containing millions of beneficial bacteria to assist in cycling new tanks quickly. With its high surface area and range of grain sizes from 0.25 to 3.5mm, it is versatile enough to accommodate various flow rates and aquarium inhabitants, including sand-sifting species. It's ready to use straight out of the bag with no need for rinsing, making setup straightforward and efficient.