Ok guys here I am again for advice. seems so often, lol. My aquarium stand isn;t perfectly level. I am afraid this is what caused my other tank to crack. It's no more than another 1/4 inch off. Ive read so much about how to level. It sits on a tile floor and I assume the floor is unlevel a little. Should I use shims?? Thanks in advance for any input. Oh by the way my new tank looks awesome and cant wait to get water in it but I want to fix this leveling thing first.