IME, if you have a reef UV will provide no measureable benefit. Claims UV units will reduce algae...well that is misleading, because it will not help with that (despite what the big box store may tell you). Chances are if you used one for 3 months you would see not difference in your tank and want your money back. I was sold one back in the day before I knew better, I recently chucked it.
If you have a fish only tank UV can be quite useful AT controling waterborne parasites if a properly sized unit with proper flow is used.
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I'm out. 
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