What I have been told is to run a uv for just 2 hours a day. By what I understand the good bacteria is out all the time. I could be wrong tho. I know it seems like I don't know much. I have only been in the hobby for 4 months.
AGA 120 Megaflow, 2x 250w HQI MH and 2x 54w T5 Actinics, Euro Reef CS135, Sump, Pacific Coast 1/10 HP Inline Chiller, PanWorld External Water Pump, Red Sea Wavemaster Pro, 4 power heads