Aquatic Creations Jellyfish Ornaments add a new level of realism to your aquarium decor. The jellyfish features a suction cup tether which allows the silicone body to float naturally in the current. Vibrant fluorescent colors glow under blue or blacklights to create a stunning effect!Realistic floating action ornamentSafe for marine or freshwater aquariumsFluorescent color glows under blue or blacklightThese aquarium ornaments are made from safe, environmentally-friendly silicone. Suction cups may be used to attach jellyfish to the aquarium base, walls, or any glass surface; simply roll up the clear string to your desired length. No batteries required.Directions: Keep 1/3 air inside Jellyfish body for floating.