Thanks for the reply and the welcome nabokovfan87 (Nabokov was awesome),
Thanks as well for sending the video - I think the major difference between my situation and that one (aside from his tank being absolutely massive!) is that all 4 corners of my tank are in contact with the stand (his was lifted in one corner causing quite a bit of torque as I understand it).
I can slide about 4 or 5 pieces of printer paper in the gap between the stand and center rim.
The tank is not on a pad. My understanding is a pad under a trimmed tank can actually cause problems. The stand has no "legs" per say, but a rectangular frame of 2x4s in contact with the floor. That frame is connected to the stand top by 10 supporting 2x4s (2 in each corner and one center support front and back).
thanks very much!
In your opinion, how important is it that a rimmed tank is level? I have heard it is less important than the surface being true (which mine doesn't seem to be anyway! lol).. but then I've also read that as long as all four corners are in solid contact, I should be fine. It's all very confusing for this noob.