Anyone have any tips for leveling out a stand? We are redoing our floor so I'm going to be draining the tank down and moving it. It's been about 1/4"-1/2" off since I set it up. I figured now would be a good time to level things out a bit. Do I just shim the stand at the floor? Do I need to have shims touching the entire outer edge of the base? Any input would be great!! Thanks.