i know i saw a chronical of how to safely remove a center brace on a stand, but couldnt find it. i thought it was on melevsreef.com, but i didnt see it. do a google search and you may be able to find it - in short, it involves using 2X4s for temporary support out in front of the tank while you have the center brace out

DISCLAIMER--do this at your own risk! i wish i could be more help.