Glow in the Dark Pebble Stone for Fish Tank Luminous Stone Assorted The light could glow in the dark after absorbing the sunlight/lamplight in the daytime Designed for use in Fish Tanks, Pools, & Ponds. Can also be used for Gardens and Home Plant pots Water, acid and alkali resistant, antioxidant Pebble style, perfect for decoration. Size: 2-3cm. Random color, 10 Pcs.