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That's exactly what I used for my 75 gallon. It did the job perfectly.For peace of mind, I would get it level. Uneven pressure from the water can cause the seal to fail. Shims work wonders. I have use these on smaller tanks on carpet and wood.
Using a foam layer between the tank and stand does not help to level the tank. The tank's weight would just compress it a huge amount. Using a foam layer is good for smoothing out any imperfections on either the tank or the stand, such as nail heads or screw heads.Agree with LiterallyHydro use shims. The use of foam board/ styrofoam between the tank and stand will also help to level it up.
Very true, that an uneven aquarium is unsafe. But there has to be a point where it's no longer safe. Whether that's 1-2 degrees or 5 degrees.Uneven water level is not safe because the lower part would have more water pressure than the higher part.
There are shims on both corners as well as every 3-5 inches apart. The tank is level all the way acrossThe main thing, for making the aquarium safe, is to make sure that the four bottom corners of the aquarium lie in the exact same plane with the tank empty, and that they remain in the same plane as you add the gravel and water.
If they do not, then the tank will twist as you add the water. This twisting will cause the seals to suffer from extreme forces, and that's why a lot of tanks leak or fail completely.
I like to level the tank with it empty to begin with so that the tank assumes it's natural "from the factory" shape, with no distortion or tweaking of it's shape. It should be "square" at that point.
The support should be rigid enough that it doesn't twist or distort as weight is applied. Then, as you add the substrate and water, the support (and thus, the bottom of the tank) remains in that shape. Square, with the four corners still lying in one plane.
Shims are great. But install them under the exact corners of the tank. And make sure your stand does not twist or warp out of square as you apply the weight.