Cool. Mine came off line due to a bad mod i did to my old Bio-Reactor so I set up a sulfur De-Nitrator which worked great in the phosphates but not to good with surpressing hair algae. So I just bought a recirculating Bio-Reactor which allows me to control my pellet rumble and effluent output. The skimmer is going crazy as always for the past week but my sps and lps have fuller polyp extension and the water is chrystal clear.
I won't take it offline when my phosphates drop to 0.0 I will just cut back on the effluence and reduce the amount of GFO I'm using by two scoops till I reach the desired N03/P04.