I know it is not what you want to hear; but I would move all liverock and most of the water to a rubbermaid or another tank located out of the way and drain the tank down as far as need be to move it while keeping some circulation and heat in the water remaining in the tank. Not ideal; but even if you drain the sump and take it away a half full 90g with a hundred lbs of rock will not move...
Good luck.
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"Government is the great fiction, through which everybody endeavors to live at the expense of everybody else." -- Frederick Bastiat
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