Should I go with a powerhead (the stupid looking thing that suction cups to the inside of your tank) or the water pump under the tank. I dont think I am real crazy about drilling holes in the back of my 55 gal tank atm. Is the waterpump overkill for something as small as mine? I dont really have room under the stand for a refugium either. Shoot me some opinions, i eventually want to do the full blown reef thing.