I ran into this exact same problem when I got my 50 gallon from them 2.5 years ago. The panes of glass weren’t squared up with each other and the bottom panel seemed out of plane. When sitting on a flat surface, only certain parts of the bottom would touch... I tried multiple flat surfaces with the same result. That said, it is still holding water after a couple years. I went back and forth with Steve from SCA on this, and refused to get me a replacement tank. He kept telling me whatever he thought I wanted to hear, and he kept contradicting himself on whether or not these issues are a problem. I’ve never been comfortable with this tank, I got tired of always worrying about it, so I actually just ordered another custom tank from a different manufacturer so I can finally get the SCA tank out of my life. Not that this helps you out much, but I’m just sharing my similar experience with you.