[fishingguy12345]

I think oak leaves will degrade very quickly which leaves you with a brown mess after a couple weeks.

Oak leaves do ok in vivaria. I have some that are 6 months plus and will look as good as Magnolia leaves I put in at the same time. That being said I love magnolia leaves.

reptizoo tank.

These don't have the front ventilation that we like for dart frogs.

 

[fishingguy12345]

I should've posted here before purchasing. Now it is what I have. Is there anything I can do to compensate for this?

If you're comfortable drilling glass you can drill holes and cover them with screen to give passive ventilation.

 

[fishingguy12345]

How soon is too soon?

No such thing , in my opinion

 

[fishingguy12345]

What humidity level does it need to be? I've seen a few different opinions on it (some say 80%, some say 100%, etc)

60-80% is what we usually recommend. But chasing after a humidity number isn't a great idea. You want the surfaces to be wet after a misting and dry off about 2-3 hours after the misting.