My Reefer 250 was looking horrible after doing well for the first few months. I was getting white slime every were, corals bleaching and no polyps. My green slimmer looked like a white stick. No3 zero and PO4 Zero. Pulled all the Refug algae, turned off skimmer for a month, overfed my 7 fish like crazy, still haven't done a water charge in 7 weeks, and dosed NeoPhos until 0.10. Nitrates still zero but the tank gas never looked better!