I'm about to set up my 125 gals tank. It is empty sitting in my living room awhile (on the stand). So i notice something not right. Just by looking at the top of my tank. Seem to be not level. Then i measure the front and the back. There are 1.5 inch different. I'm glad it is empty. Or i would have a big problem with water and all the set up .Anyway, is there a simply way to level this tank? May be rubber shims from home depot ? Please help.....