Rocket I would love to know how you have delt with water movement/surface movement in your 55. My 55 is also a room divder and I am currently struggling with how to get good surface movement from my Magnum350 pro set up.
I have taken out the blue rock, replaced it with black sand, I love the change, I have also removed the Air pump and am trying to get away with only using the Magnum, I am not to happy with my surface agitation though.
I have a UnderGravel Jet system that moves the water low in the tank real well, now to get the surface taken care of.
Here are a couple pics of the set up I built: