I have an 82 gallon in the planning stages...I have been deciding between 2 mp10's or 1 mp40, I know the mp40 is more powerful but I also think the randomness of the 2 mp10's would make this a better option. My tank will be placed in a large cubby hole with the front and right side showing. I am getting ready to drill the back for my overflow but really want to put it on the left side so its doesnt stick out as much. For aesthetics I dont want to have a powerhead on the right side glass either, this is where the 2 come in, one on the left side and on the back glass...Would this be better than just one 40 on the left side??