Is a 20L large enough for a male bp?

My tank is all set up but now i cant help but feel my bp will outgrow it fast. I put quite a bit of money into it so im kinda bummed and wondering if its even worth it or should i just abandon the tank and get a tub? Maybe im just overthinking it idk.

a 20 long is more than enough, keeping humidity will be an issue though.

If you haven't already, there's a good thread on setting up an aquarium of exactly this size. Check out the link in my signature for a good place to start!