Features: Underwater coral are sustainable in salt and fresh water. For Aquarium, fish tank, garden, yard, hotel and landscape. Made of non-toxic silicone and resin material, flexible, realistic and vivid. The glowing effect is the fluorescence effect. The item does not shine in the darkness, it needs aquarium lamp irradiation. To get better effect, we recommend blue & white light, blue & purple light. When you open the package, put it in the water and it will stand upright immediately. The soft high-simulation coral is used for landscaping in sea water tanks. The shape is realistic, the colors are gorgeous, and the dynamic is full; it can create an ideal underwater world for you. Specification: 6 Pack Design: 1 x coral reef, 1 x anemone, 1 x lotus leaf mushroom rockery, 1 x Starfish and 2 x floating jellyfish Materials: Non-toxic silicone and resin Tips: Before putting these decorations in the fish tank, better wash them with water or soak the decorations into salt water for a while. The best way is to wash the decorations and soak them into the water inside the fish tank for about 2 days. The glow decorations are 100% contains no harmful ingredients, but the changing of the aquarium environment may cause the fish to get sick. So after putting the decorations, try to keep the PH value and temperature of the fish tank consistent with the previous. Especially small fish tanks.