On my 75 gallon RR tank. I can usually go a couple of weeks before I need to clean it. I have to scrape the coralline algae off and a very little bit of algae off. I am running 2 150 watt MH (8 hours) and 4 55 watt T5s (12 hours) and Chaeto in my sump. Then I have a curve 7 skimmer too I run in my sump. For return pump I have a mag 7, Jaebo wp-10, and Koralia 1150.