The initial spot I wanted to put my Waterbox 180.5 turned out to be too unlevel for the provided leveling feet to compensate for so I decided to wait until we renovated another room to setup the tank. I actually ended up having the same issue with uneven flooring in the next room (the house...
I built a tank stand 3'x 2' x 2' - the stand top is flat, no decorating trim.
Tank is a rimless tank - about 70Gallon
The top is a bit uneven, - I think the board that I used for the top was not even.
I did bought the self-leveling mat from Innovative Marine-...