I'm getting either a 180 gal w/ built in overflows, or 210 w/ built in overflows. I want to set up a large sump and was thinking about buying the AGA Megaflow Sump Filter Model 4. Does ayone have experience with this filter? Or does anyone have any better ideas. I also have a eheim Pro III w/ carbon and nitrate rocks which I'll use one week out of the month to "polish" the water. Which ever sump I get I want to fit the Euro-Reef RS-180 Protein Skimmer in it. Any idea will be greatly appreciated.