This beautiful Purple with Green Glowing Sabellidae by Underwater Treasures; also known as a Christmas Tree Worm is an incredible replica which will improve your custom aquatic environment through its special features. This ornament will glow underneath actinic lighting; demonstrating a super cool night effect and daytime effect. Even without any light at all, in complete darkness it produces a gorgeous soft light as your fish roam the night. You and your fish will appreciate the excellent glow and magnificence through this fine ornament. It is safe for all fish in both freshwater and saltwater aquariums. 2" x 2" x 3"