Personally, if it isn't off that much, I wouldn't worry, but otherwise I think wooden shims would work. Only problem is that maybe they can deteriate over time from weight, water, etc.
My tank is off just a bit, but I never adjusted. It was perfectly level when put in place, but after time with water it is off a bit, just slightly. If you look hard you can see it. I use a level quite often to keep tabs on it, as it is on a second floor of my home, and it has never moved. Using the level, the stand is level, if I put the level on the light it is level, but if I put it on the tank it is off a few millimetres. Oh well, I am not worried.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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