Biggest ever... I broke down a 125 gal, removed it from the stand, took it outside, painted the back glass, brought it back in, put it back on the stand and set it back up. It took forever to move up and down. I wasn't so sophisticated to use jacks and straps, I stacked milk crates, books and boards.
Recently... I can move 75 gal around the house and on the lower rack of a stand, but I called for back up to put one on the top rack. I move 40 gals pretty freely.
I have a few glass 6' 234 Gal tanks in the garage I need to build stands for and get set up. We had 4 guys to unload them from the trailer. I may maneuver the ones for the bottom shelf myself with dollies. But there's no way in hell its coming off the ground without at least 2 other guys here.
20-30 years ago I looked at things like moving big tanks as a personal challenge. But today I'm too old, the pains last too long.