SDguy- Does that mean it's pointless to run a UV sterilizer at all? I never have and have had no ill effects on my tanks. But some people ( and stores ) still recommend them.
I'm going to have to dig it up... but there is a thread where a guy actually did the math with organism size, contact time, and intensity. IT's not pointless if you size it properly. I know very few people that are willing to spend that sort of money.
On a personal note, I had a UV almost immediately get rid of ich in a tank.... the ich was getting REALLY bad too. However, it was a small tank with a big UV...it pretty much came to 1W per gallon.