So I hooked up a 9watt uv sterilizer to my 75 gallon cichlid tank that had zero algae problems but my buddy swears by them to keep your tank clean even if you dont have algae...wow what a difference. My water was very clear as it was but adding that made it amazingly clear. I had no idea about these things now Im getting one for every tank..highly recommended..anybody else having luck with these?