My new 150g will be going in a room with tile that is quite unlevel exactly where I want to place the tank. Right in the center of where I want to place the tank there is a bump in the floor, causing the stand to wobble back and forth, as well as lean forward about 3/8-1/2". The gap between the floor and stand is about 1/2" on the right side and I'm afraid of shimming this much as my stand uses a bottom rail to distribute weight. What would be my best course of action to level out the stand and tank?