You might want to support or jack up the floor. Thats alot of shim. Do have a basement or crawl space?
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Tank is in the basementYou might want to support or jack up the floor. Thats alot of shim. Do have a basement or crawl space?
What you did looks fine. You won't have much weight on the sides, this is okay for most stands, but maybe not if it is custom, diy or weird in some other way. Both the carpet and floor will move once you fill it and it will be off level. This probably isn't a big deal. You can fill it with tap water just to check if you are really anal.
I have floor stands in my basement for added support. After I filled a perfectly level tank, I had to jack up the floor to level it again. This is not needed even for my 270. It would be overkill on your 120 but it is an option.
I recommend you keep an eye on the level while you're filling the tank- once mine was filled, it resettled and I had to add extra shims
I will keep an eye on it. Right now is perfect leveled. I know once I fill the tank it will move a little. I hope it wont move a lot. I don want to re do all this work again.I almost always suggest a solid piece of wood, under the stand when on carpet. never know how/where it will settle and it distributes the weight across the whole piece. the level from/on the plywood. but i might be crazy.

