Forget the tank, I want more pics of those trees!
Another option would be to add (appropriately rated) leveling feet to the bottom of the steel stand and do it that way. I would probably use shims. I don't think it would be easy to level with concrete.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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