It appears to me that the value of UV depends a lot on the type of tank that you have. If it is already fairly sterile like a FOWLR tank, then UV seems to help with disease control (not Valonia or Aiptasia, those are not waterborne diseases).
If the tank is well populated with coral and has a good live sand bed, then the UV is less likely to help the tank in general because of how it kills everything in the water.
Ozone used in a skimmer is a much better method for controlling disease in a full reef aquarium, IMO.
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Mark Peterson wrote:
Did Mark really say that? Wow, you've sure changed. 
It's been good for me to work at the place "which shall not be named." I've expanded my horizons. I can really relate to the Bill Gates quote in Jon's signature line. 
