Looking at sumps, my return pump is 8.27 inches long, the chamber on the sump i like is 8.5 inches long. Is this going to be a problem? Obviously it fits but i didnt know if i should get one with a bigger chamber for any reason.
Does your return pump have a guard on the front? If it does (and it's part of the 8.27"), taking it off will free up some space. If you don't need it to catch anything you can leave it off.