Level tank

[marineman41]

I leak tested my 187 gallon aquarium last weekend and my tank was level.
This weekend I started filling the aquarium with RODI water. The tank is about 3/4 full and I decided to stick the level back on the aquarium. Left to right it was perfectly level. Front to back the bubble was in between the lines but not perfectly center. I took out a measuring tape and measured the top of the water line to the top of the aquarium. Left to right they measured the same distance. Front to back the measurements were off about 1/8".

Is this going to be a problem going forward?

I am going to fill the tank completely to see if it levels out on its own.
The tank is sitting in my basement ontop of the laminate flooring on top off concrete floor.

Thanks for looking.