Aspire nautilus 2 glass won't come off.

Hi guys, I'm the owner of a nautilus 2 tank since yesterday. I'm quite pleased with it but I have a few problems.

1. The top cap is really hard to unscrew when I need to refill.
2. The glass just won't come off, I literally tried everything. I have to use pliers to screw the coil.

Any suggestions/help please ?

THank you
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