Re: Glenn's new RSM 130D
A cubic foot (12" x12") of water weighs 62.4 lbs. Maybe that will give you a bit of an idea. Then add the tank, rock and sand weight. I might try to add another able body to the moving crew if you can. I know my old back couldn't handle it!
I'd pull the hood and be sure to siphon out the back too - I don't think it will drain past the gate level?
You'll need a temporary place to put the tank too - while you move the cabinet - hopefully something strong and raised, to make it easier to lift the tank back up and onto the relocated cabinet. Fun? NOT!
Per Red Sea the tank weighs about 440 lbs full, with water, rock and sand, but I can't find an empty tank weight,