I purchased a 35 gallon seapora cube and stand back in February. The stand it was sold with I believe was made for the JBL cube style aquarium's as the front wasnt square and had rounded corners. So when set up only the back two corners were flush. The front two corners were slightly exposed due to the rounded front of the top panel. The cube is a perfect 20x20 aquarium so approximately 35 gallons. My main issues with the set up was the swaying of the stand when set up. It would sway from left to right with a slight nudge. Having 3 young children I become stressed after awhile and decided to try my hand at a DIY stand. It's made out of 2x4s with the standard design. Top frame and bottom frame with 4 guides and supports on each side of the guides between the upper and bottom frame. This is built like a brick and I went overboard doing so. It has approx 100 2.5 deck screws holding it together at the joints combined. Stand has 2 back supports running horizontal as well just for extra precautions from swaying as I wanted the height at 32 inches. Front has a door made out of left over 2x4s. Left, right, and back sides were left open so I could easily access canister. My concern is that after having this set up for two months, on my last water change I noticed the back left corner has a gap between the black rim of the tank and stand top frame. I made sure it was flush during the build using a level. I would guess the level is off as that's the only explanation for this flaw. All other 3 corners make direct contact as well as the rest of the trim. Just the back left corner which sits 5/8 off top frame connection. I've attached pictures showing this. The gap isnt much either. Cant really measure it but its wide enough to firmly squeeze 4 cards between. I never fill it to the top for flow reasons so it stays approx 2 inches from top and with a 2 inch substrate level I would guess its holding 30 gallons of water. Should i be concerned? I've read all 4 corners of these rimmed tanks need supported. But I'm also thinking back on how it was sold with the original stand and how the front two corners were exposed slightly when set up. Am I being over paranoid? I really dont want to spend a whole day rebuilding and painting a new stand just to find out it could potentially be a flaw in the trim or that one 2x4. Using a new level it appears to be perfect when checking top and bottom frames from the sides.