Finally getting around to setting up my 30 cube. I have the Zoomed 501 filter for it and was wondering if it HAS to be put on the same level as the tank, the book recommends that this be done this way. I really dont want this filter sitting beside an ADA cube, really takes away the aesthetics for me. So have you run one under the tank, mine would be about 18-20" or so. Anyone see a problem with this. Im sure the flow will be reduced.