your at the upper limits of what you want to use a NW110 with and most certaintly should go for the NW150 if you plan on a heavy bioload. based on the size of the body 60g with a light load and 30gish for an SPS or heavy load tank would be an accurate euroreef type rating (actually a euroreef tech said they'd require a 4" body to adequately skim a 60gallon. there RS80 with 5" body is rated for 80g). NW150 footprint is kind of uneccessarily big because of the pump and output position on the body (about 10"x10") but the skimmer body is 6"x23" or about the size of a coralife super skimmer 220 but shorter.