Three weeks is a short time. You should start seeing major mold/rot problems soon. I would just keep the lid open all the time without taking it out of the jar. Make sure to decant excess water accumulated at the bottom. Or simply pot the plant up. Or you can buy yourself an acquarium and keep it in there for high humidity. You are going to need better ventilation, no way to go around it. It does look nice though. Good try, glad you asked us though 
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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