your thinking about something else sign guy.
i run 3 MJ1200s and my return pump on my red sea pro. I love it! I tried to use mj mods on the pumps but everytime it starts they give a loud "zzzzzrraaaap" sound when the propeller hits the anti-reverse rotate clip. so really you can only run unmodded maxi-jets. on one of the mj's i have a hydorflow spinner wavemaker thing, it works great on there.