I agree that you should sell it. I have moved a 250+ glass the other day and it was not fun. You guys are going up STAIRS with this? "FOR GET ABOUT IT".....
Sell this before someone gets hurt. Get an acrylic tank or find a new place to live.
I would not even risk having 6 strong men to move this monster cause in the end like someone mentioned, there will only times when 1 person will have to bear the whole tank on one end and this is not fun.
If you do decide to keep this, hire a moving company with insurance like ^ suggested. Stand out of their way and take photos along the way.
Good Luck.