I used shims to level my 125. I put them on each side in the front. Should I have put one in the middle of the stand, halfway between the other two I used, or will It be fine without that support in the middle?
One in the middle would be a good idea. It'll spread the load more evenly.
BTW, Are the shims between the tank and stand or stand and floor? IMOP I would only shim between floor and stand. Then use some styro between tank and stand.