Upgraded compact UV sterilizer for improved aquarium water quality,Kills free floating green water,algae,parasites and harmful bacteria, Universal adapter allows sterilizer use with Saltwater and Freshwater,Planted aquariums Enhance water quality in tropical Aquarium Systems and other reptile aquariums and Included universal adapter increases installation options for versatile application. Miniature sterilizer improves aquarium water quality with cleansing UV-C light that kills free-floating green water algae (green algae ),parasites and harmful bacteria, 3W UV Sterilizer with low-voltage ballast attaches directly inside aquarium water or with external filter pump for easy setup and use.