First, level the top of the stand, no tank. Shimming under an empty stand is pretty easy. Next add the tank, check again. Since you are dealing with a carpeted surface with concrete underneath there may be a bit of give to the carpeting as you fill, but probably not much. Keep checking level as you fill, if it gets way crazy out of level you've got a back & forth guesstimate situation as far as how much to shim it once filled. Make sure the back of the stand is far enough away from the wall to not be resting on the tack strip under the carpeting.
You want something that doesn't easily compress for shimming, carpet is not one of those things. Shims used for window & door installs are ideal for this, cost about a buck a bundle at places like Home Depot.
Tip the stand forward, put shims where the feet go. If you want lay them next to the stand, tip it & slide them in the width of the shim. A carpet will compress, either now or later, won't be real long with 180 gallons of water & gear on top. When it does you will be out of level again. You don't want anything between the tank & stand with a floating base designed tank.
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