I just installed a new Fluval 404 filter on my 75G. In the instructions it stated that I should keep the output nozzle above the water line (If I read correctly). I prefer not to have the splash effect so I mounted mine just below the water line. It is close enough that it still stirs the top of the surface. Can anyone think of any problems this may cause? I couldn't find anything in the manual that stated why it should be above the waterline.