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I would recommend not using one in a reef aquarium unless you are combatting a particular disease. Since it kills all of the micro organisms in the water, you kill many of the nutrients that corals use to stay healthy.
CJ
I don't know about ick, but I have seen a few very nice full blown Reef setups that run them with great results. a lot of people use them as a water polisher to get rid of yellowing compounds in the water column which is good for sps. In fact I know a guy who has an awesome sps tank that uses one full time and he has absolutely awesome growth and colors on his sps, so I am not sure what good stuff is being killed, but I do know its not effecting anything in a negative way on his tank.

I've been using one 24/7 for over a year in my 28g dominated by lps, sps, softies. Have not had any problems with fish illness. In fact helped kill my algae bloom which has not since recurred. Also my coral growth has been great. So not sure where the uv myth comes from. I am now planning a 100g upgrade and will run uv for sure on that system too.

I currently run a uv sterilizer. I have seen a few very nice sps tanks with certain fish that some people claim to be impossible to keep I noticed the main thing they have in common is a uv sterilizer ran all of the time.
I got myself one and am very happy I did. Now that I run my uv sterilizer I have crystal clear water (you won't understand the difference until you add one as it is hard to explain), only have to scrape my glass about once every three weeks (not necessary either as I only scrape my front glass and there isn't much of a difference between the sides and front), and I keep some difficult fish with ease. I constantly get asked how do I keep my tank so clean, and people wonder how often I clean it...when I tell them they can't believe it. Before I got my uv sterilizer I'd have to scrape about once to twice a week. I also upgraded to an h&s skimmer about the same time and have the uv feeding the skimmer. I like it and will not go without again, but there are people strongly opposed to them for whatever reason I don't know but from experience i can tell you it works.
Good example, I added a powder blue after a four week quarantine in copper. Still broke out with a mild case of ich due to the harassment from my yellow. No other fish showed any signs ever and within three to five days he showed no signs either.

