Someone wrote a couple of days ago that the wet/dry sump needs to be 1/4 the size of the main tank. So if I get a 180 gallon tank, will I need a 45 gallon sump? Then the question of turnover comes up. So if I get this 45 gallon sump plumbed correctly, should I shoot for 2000 gph with this thing? I'll bet the noise sounds like a hydro-electric dam! Anyway, with a 2000 gph wet/dry (if that's possible), do I need any filtration back-up. I am now planning on hanging on 2 HOT Magnums with that micron filter for water flossing. That will give me another 500 gph, but mostly mechanical filtration. Any thoughts on this, especially having a 45 gallon, 2000 gph pump.