Good Quality Lifegard AquaStep Pro 25 Watt UV Sterilizer, Blue, 200-gal

The Lifegard AquaStep Pro 25 Watt UV Sterilizer helps to keep your aquarium water clean and healthy for your finned friends and plants. This filter directs water back and forth across UV light, tripling the contact time with the light. It helps to eliminate the spread of disease-causing microorganisms, and it spreads out a thin waterfall to maximize oxygen in the water. The molded base lets you easily install it beside or below your tank, and the flat side lets it fit snugly or hang on any aquarium or reservoir tank. A spring-loaded clamp on the top creates a snug fit, while bottom screws help to keep it level when installed in the hanging position. A clear view port lets you see at a glance if the bulb is working.