AQUARIUM SAND: GloFish Aquarium Sand creates a colorful base for all your GloFish ornaments. FUN COLOR: The black sand with fluorescent highlights complements your aquarium décor! BASK IN THE GLOW: Fluorescent-accented sand stands out under GloFish blue LED lights. HIGHLIGHTS YOUR TANK: Use as a substrate or accent, along with GloFish plants and ornaments (sold separately). EXPERIENCE THE GLO: GloFish fluorescent fish and products create a complete underwater fluorescent experience.