The Calofun Aquarium Fish Tank Decorations Luminous Sprite Theme is a great way to add some style and color to your aquarium. This set includes eight different types of luminous tree elves, one hollow tree trunk fish hideout, and ten plastic plants in different colors and sizes. The elves glow under the moonlight in the dark, brightening and giving light to your fish decor. The set is easy to install, just cleaning and putting it into our aquarium kit.