AuqaShield™ 10 Watt UV Sterilizer Water Clarifier [Universal]Your First Line of Defense Cloudy water, Algae and parasites lead to the frustration of many hobbyists. The main reason why these problems occur is that each multiplies quickly; free floating in the tank, unseen to the naked eye. Only when its too late, the hobbyist becomes aware of their presence. By adding a UV Sterilizer into your aquarium, you can minimize the risk of these problems occurring. Germicidal UV lights have been used for decades by the