AA Aquarium Green-Killing Machine Internal Aquarium UV Sterilizer, 9 W

Are you experiencing a sudden algae bloom or cloudiness in your aquarium? Have you already tried chemicals after chemicals and very frequent water changes? If your aquarium is 50 Ga (200L) or less. Simply place the GKM 9W into your aquarium and have clear water in days without chemicals! Green Killing Machine makes fighting green water easier. UV light rays are effective in controlling free flowing bacteria, yeast, molds and other pathogens, in turn clearing up green water or cloudiness without any chemicals.