Having Mass Issues Leveling My Tank

I recently moved to a new house and the floor is slanted and the left side of my tank had a higher water level so I bought wooden shims and jacked the left side up and added middle support which should even it but the water level in my 55 gallon didn't change and still isn't level any idea how I can fix this?

 

If possible, take the aquarium of the stand and level it out. If not possible, keep trying to level it out with shims.

 

I would do this before the tank is filled and use a level, check side to side and front to back.

 

Welcome to Fishlore!!! Good luck with your tank!!!

 

I would do this before the tank is filled and use a level, check side to side and front to back.

What I did was left around 4 inches of water in the tank so it would have some water weight. But I double shimmed it and the tank is almost level I'm guessing the corners hold the most weight? Also how do I go about adding support to the back of the tank? Mine is agains't the wall and the bottom of my stand is covered so I can't add the support inside the stand.

Welcome to Fishlore!!! Good luck with your tank!!!

And thanks I was on here a few years ago but forgot my old username.