I had to call a moving company to move my tank. I looked around for moving companies that specialized in moving art or antiques. It turns out one of the aquarium maintenance companies locally had worked with a mover and gave me a good reference. This company had moved multiple huge tanks including needing a crane to lift tanks into condo's in the city.
They moved my 62x39x24 glass tank with 4 people, dollies, and many straps through the front door and down a winding (but really wide) staircase to the basement.
Although they were expensive (3 hour minimum!) they were very professional, experienced, and more importantly, insured!
I would consider calling around to some local aquarium maintenance or installers for references.
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