Hi. I'm trying to upgrade my two turts - I got a good craig's list deal on a 75 gallon tank, and I went out and bought a brand new Fluval 405. I decided to set this up in a basement room, it seems like the best place. The floor is cement with a thin pad and carpet.
So I set up the tank, and notice, it's not level. I'm pretty sure the "problem" is the floor - it slopes off slightly to one side.
Right now - if I measure from the water line to the rim, on the left side it's 9.0" and on the right it's 8.5" - So the left side is lower by about 1/2"
Is this a big problem, or am I okay to finish filling and use it in this spot?

