Saim Glowing Effect Artificial Mushroom for Fish Tank Decor Aquarium Ornament The artificial mushroom is made of non-toxic silicone to look extremely realistic and natural. Suction cup base keep the item stays under water. Glowing effect means: Not "Glow In the Dark", it requires aquarium black or blue lighting for the fluorescent glow highlight. It is vividly and color detailed to add lively and natural life to your tank. The mushroom measures about: 4" x 3" x 4"(L*W*H)