Does anyone use these things? Are they a gimmick? They sound good in theory but how well do they actually work? I hate the fact that I have to clean my glass every two or three days to keep it as clean as I like it to be. Will this help? Also, "IF" I decide to get one, I doubt I have enough room to place one in line w/ my return pump. How should I plumb it in? Would I need to just get a new pump and have it's own closed loop in my sump?