Saim Glowing Effect Artificial Coral Ornament Aquarium Fish Tank Decor Glowing effect requires aquarium lighting for the fluorescent glow highlight. Decorate your aquarium all the time with minimum maintenance. Adds a touch of beautiful vibrant color to your tank. Size measures about: 2.9"/7cm base Dia. , 4"/10cm height. NOTICE: In order to get better fluorescent glow highlight, PLS put Blue, Pink, Purple coral under aquarium PURPLE RED or RED lighting; and the GREEN, ORANGE, YELLOW under BLUE or BLACK light.Thanks.