120 Gallon Aquarium uneven by 1/5 of an inch

[geelongfish]

Hi guys I am just setting up my new 120 Gallon SW tank . I have noticed the front left corner my water level is 1/5 of an inch lower. The back left and the front and back right are even. At the moment I can't figure out why.

I am going to get some help in determining why. But regarding the unevenness is this something that could make the tank crack ?

Thanks for any help

 

[geelongfish]

Pictures below

 

[griss]

So, you're off by roughly 1/2 cm. Either your floor or the stand are likely off just a bit. IMO, I would tap a shim in under the front left of the stand to see if you can even it up. How does it look with a level on top of the tank?