I've had my 125g setup for 2 months now and up until 3weeks ago I didn't notice that my water wasn't level, it's off by about 1/8-1/4". I didn't think to much about it seeing as my 55g at my old apt. was off about the same and it was fine for 4 years. But being a much bigger tank I decided to do some searching on the subject and now I'm totally freaked.
I talked to the owner at the LFS today and he said that I wouldn't have to completely drain all the water to tap a shim in, your thoughts on this?
BTW the tank is on carpet.
I talked to the owner at the LFS today and he said that I wouldn't have to completely drain all the water to tap a shim in, your thoughts on this?
BTW the tank is on carpet.

Unless you have a 6 foot leveler it's pretty much a trial and error process. Shim and fill 15% water to see it it's level. If not then drain and re-shim. I have an old house in the 1940's and the floor is all whacked and uneven. 