Instability with a 55 Gal

[Fin Man]

I recently purchased a 55 Gallon Tank with Stand. I've kept these before, but i lived elsewhere. I set up the think and filled it. The stand is sitting on Carpet. That's where the problem lies. It's SLIGHTLY Unstable. I can push it and it will rock a little. There's nowhere in the house to put it that doesn't have carpet. Do you think that a 75 Gallon base would make it more stable? I don't have any kids or pets in the house. I live alone. What would you guys do?