Originally Posted by Threed240
I bought one of these this weekend, and I am truly impressed. I had a problem with one of my mj1200's falling off the glass, due to suction cups. I bought the sure flow, and the hanging clamp. I am going back to get another for my other mj1200. Id say two of these, plus my return pump, and another rotating power head (which is junk, 300gph but you have to manually rotate now due to coraline), would be enough for a 55g.
That would be a lot of flow, which should be good for all your corals. You probably wont even need the other PH once you get 2 sureflows in there.
Just aim them so the flows crash into each other and you'll have great random turbulent flow.