The AZOO Fluorescent Dazzling Sand provides an exciting nighttime landscape with the use of an AZOO (UV) Black light Firefly or Galaxy light. The (UV) black light activates the fluorescent material in the color to glow and provide a whole new experience to viewing nighttime fish activity. The AZOO Dazzling Sand provides an exciting colorful landscape in any aquarium. By mixing two or more colors anyone can create an unique layout of design in any size tanks. 2.2 LB per bag. Color: Green.