Issues with humidity in my PVC tank

[Homebody]

Hey all, so I recently moved my snake into a 4 x 2 x 2 PVC tank from Cornel’s World with hinged acrylic doors...

I got a description from their website. This enclosure has built in vent holes, so my first suggestion would be to cover them. I'd just use tape, at first, to see what effect it has. If it works, you can fill them with spray foam or silicone sealant later for appearances sake. If that doesn't do the trick, you can also add weather stripping around the doors. That should reduce ventilation even further.