A UV (Ultraviolet) Sterilizer utilizes a germicidal lamp, which reduces free-floating algae, bacteria, parasitic, fungal, viral, and other microscopic planktonic organisms by exposing it to high intensity ultraviolet (UV) light. Although the disease reducing benefits above are significant in producing and maintaining a favorable environment, UV sterilization should not be relied on as the primary source of a filtration system. UV sterilization can be a very useful addition to an appropriate filtration system. Suggested wattages are 4-8 watts for 20-40 gallon aquariums, 20-25 watts for 50-100 gallons, and 40 watts for larger aquariums. In order to have optimum results please find a UV Sterilizer that will be compatible for your application.