The UV is only one for 2 hours during the day unless I get an infection or I'm introducing livestock.
Granted it kills off all the bad stuff in the tank but it also kills the good stuff too. I.E. micro-organisms. Which is why most reefers don't run UVs. I've found it a good combination to run it for 2 hours a day everyday. As it also has help with the water quality.
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Photo anyone?
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