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Uv lights are the great debate. I think that they are beneficial. They will get rid of free floating parasites and algea spores. I`ve not had an ick outbreak or algea outbreak in over 6 years. Is it because of the UV? Not totally I`m sure,but it does help along with my feeding schedule and PWC`s and other things. But along with your LFS opinion along with mine just remember one thing. Opinions are like armpits. We have two of them and they both stink. Have a wondeful day.