I had to do some serious floor reinforcement for my tank, and so while I was installing the floor jacks in my crawl space I also leveled the floor that way. probably the most solid part of my house now lol. Also used the pink insulating foam from home depot for under the tank to absorb any minor warp in the stand or floor. Its the high density stuff and it barely has an indent where it sticks past the tank. Now on the kids 29 gallon I didn't bother doing any kind of leveling at all