Tips to get stand level.

[Sasq40]

So I built a stand made out of wood that's wrapped around a steel frame. The tank had a rip around the bottom and isn't sitting flat on my stand. It's On top of 3/8 plywood which is sitting on top of the metal stand. Now I'm assuming the metal is not flat but I figured the wood would allow the tank to sit flat. I was wrong and it rocks a bit. Can I throw a piece of cardboard under the tank to make up for the uneven corner?

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