I have never ran a UV on my tanks. I just did not feel the extra expense and maintenance was worth it. However if I had a few $1000 invested in fish, I would probably use one just for the extra piece of mind.
If your just looking to cut down on algae growth, a UV is not the best option.
There are far better methods for reducing algae for much cheaper.
A UV will really only deal with a suspended algae bloom.
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