Glowing Effect Artificial Stone Conch for Aquarium Decor Fish Tank Decoration The artificial pebbles is made of non-toxic silicone and plastic to look extremely realistic and natural This aquarium ornament decor is enhancing visual appeal,perfect for decoration Glowing effect requires aquarium black or blue lighting for the fluorescent glow highlight Safe for fish and good for fresh or salt water environments 5. Material: Photoluminescent pigment + resin