(UV)Ultraviolet Sterilization is a proven and effective method for controlling and extracting algae spores, bacteria and other protozoa that are present in the water column. It is extremely beneficial in destroying disease causing pathogens as water is pumped through your UV sterilizer. It is a great tool for fish only tanks. For treatment of disease in an aquarium it is recommend to use a 8-9 watt sterilizer for up to a 50 gallon tank. We offer sizes up to 114 watts.