I will jump on the Seio bandwagon. I have had 2 for over 2 years now and neither has ever locked up or failed to start, ever. Much more efficient than Maxijets, move more water for less watts and produce less heat. Plus the flow is more diffused so you don't blast your corals or sand bed. 8 watts for 620 GPH or 23 watts for 292 GPH.......No comparison. I do use smaller Maxijets for other purposes but not for movement in the display tank.