One of the best things you can do for yourself is provide decent ventilation below decks. Doubly so with a Paradox and it’s inside sailing configuration.
My solution is a combination of fans and a covered hatch opening.
This is a 140mm computer fan installed into the vent trunk opening. It is only attached with two screws for easy removal or reversal. I leave it running pretty much 24-7, even when the boat is in storage.
The second part of my solution is a strip of lexan on the back edge of the sliding hatch. This allows me to leave the hatch open about an inch without letting any rain or splashes get in. I also made the lexan for the back window extra tall to cover the back side of the hatch seal.