My 55 gallon aquarium has settled on the styrofoam padding, and is tilted slightly forwards. I am especially concerned that the water level changes 3/4ths of an inch from the front of the tank to the back. The basement floor might also play a role in this issue, as it is slightly uneven. I am just wondering on how i would go to correct this issue and properly level it. It is a fully established tank that has been running for about 3 years. Its a lot of work, and I don't want to screw up something that could cost me in the long run. The tank sits on 2x4s that are above cinderblocks. I would enjoy some input on how I should approach this problem.