I don't run one since I'm using a bacteria-based system (ZEOvit in my case).
If you are interested in running ZEOvit, ProdiBio, BioPellets, or Vodka, I would recommend against it, since UV will not do well to the bacteria you are trying to culture...
If you are looking at a more time-tested method (refugium with chaeto, and tuns of live rock) well, the "survey says" it's likely a good idea.
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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