I don't know, I have a Euro-Reef in my 20gal sump. As long as I keep on top of the evap every 2 days then I have no probs with micro bubbles. And my sump has no bubble trap. the skimmer and pump was a real tight squeeze in my sump tho. I went with the CS6-2 for my 110 tall with the thought that if I upsize my tank someday, the 6-2 would be able to handle it.