i was gonna say its an all-glass and has been set up for about 1 mnth now- and i reallly dont wanna take it down just to raise it up a lil bit , its really not that bad, On a level the air bubble is just a hair over the other side but almost within the 2 black lines-
I have shimmed a 180g when full without issue. I put a shim every 12" and went verry slow only pounding them in 1/4-1/2" of the shim at a time. Once I had them 1/2 way in place I put additional shims every 6". Perhaps I got lucky but have had no issues.
<a href="http://s195.photobucket.com/albums/z46/NVMYNOVA/?action=view¤t=DSC00335.jpg" target="_blank"><img src="http://i195.photobucket.com/albums/z46/NVMYNOVA/DSC00335.jpg" border="0" alt="Photobucket"></a> this is the level
I'm not saying it won't be fine but, that bubble will be magnified over a long distance. If you are going to lose sleep over it... then you should fix it. Can't you just shim under the stand without having to empty the tank? I shimmed under my stand.