My rimmed 55g tank is leveled but not flat on the stand.should i be worried?

[thisonefish]

i can fit a card between tank and stand but I heard that all rimmed tanks arent perfectly flat because of the silicone. My tank and stand are brand new and not warped. should i be worried?what should i do?

 

[Brookster123]

Pictures of gaps, where are they? I go around the perimeter of my tanks and if a shim fits it stays. Wood is imperfect.

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