I swear my tanks look cleaner since running uv in them...but then again maybe it's all in my head, kind of like when you clean your car and you think it is running better lol.
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It's not just in your head. A properly set up UV sterilizer does work and, in my experience, works rather well.
-Ben-
"Wisdom is not the product of schooling but of the lifelong attempt to acquire it"
- Albert Einstein