unleveled tank

So I've just put my 100 gallon tank on the stand and I've realised that in one corner/along the side the tank is not sitting flush at all. That gap runs along the short side of the tank to the back corner where it does sit properly. I have trying using shims but it doesn't seem to help...

Just wondering if my reefer 170 is okay being a tad unleveled. I filled it up with water over the weekend and noticed based on the water line that it’s unleveled. I used my iPhone as a level and apparently that is not very accurate. Here are the measurements of the water line from the water line...

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-...

My tank generaly has a lot of flow on the surface, but I turned off the pumps the other day and noticed that the tank is not leveled. Yikes! It is not a lot, but it is not minor either. When everything is turned off, the waterline in the back is about 54 millimeters off the top, but only...