How to level a large aquarium?

[colesjensen]

I have a 220 gallon tank and it is leaning to the left. What's the best way to level it?

 

[jasonrusso]

Already filled?

 

[colesjensen]

Already filled?

Not yet

 

[CastAway]

I used metal strips, and plastic shims. Important to level the stand, and not the glass on the stand. This way the stand abdorbs the stress, not the glass.