Nautilus: Cannot open Tank

After intensive research and trying several methods. I write here.

I cannot for the love of Cthulhu open the tank to refill. It's not moving! I'm a very beefy guy, but nothing. I cannot open the damn thing. It's really frustrating.

And I already tried that thing:
We suggest the use of soft lint free gloves or cloth, much like those used to clean eye-glasses, to help with the disassembly so that you do not scratch the glass tank.
First screw the upper hardware tightly,then unscrew the base hardware.
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