I would empty it and do it right where you have the tank Chris. It could be done with your tank but I don't think you need it. Personally I will never build one inside the tank again. It causes light blockage into the display and can become an algae haven. I kept screens in mine when I was into more natural filtration methods and used it like an ATS (algae turf scrubber).After hearing the noise in my sump, I am begining to think I should have gone with a C2C on my 180 with full syphon. Is that something I can add later on without tearing down the tank?