I currently have my 57W UV running 24/7 but that seems a bit much now that my fuge is set up. I was thinking about going to a 12hr or a 24/7 week on / week off type schedule.
How often are your UV's on?
Mine is on 24/7 as well.....however my understanding is that your fuge serves as a different purpose..The fuge helps the nitrogen process, while the uv is a steralizing device that helps to destroy protzoan bacteria ( such as ich...and so on)