Hey everyone! Im a beginner at all this and have a few questions..

My terrarium that i have set up is a 12x12x18 by ZooMed
i have a waterfall kit coming through a cork background with a vine and some plants with moss on the ground.
i do have hydroballs on the very bottom then separated by a mesh sheet then with ecoearth on top of that.
Im using a UVB bulb also.

Now my question involves the humidity in my tank. I have a gauge and it is reading 85% humidity and im afraid im going to get harmful bacteria. Is there any way i can check for this? I am really interested in getting a red eyed tree frog and want to be sure my terrarium is perfect.

And it seems that my humidity is very high, is there any way i can bring it down?
Thanks for all the help!

Here are a few pictures for reference! Ignore the blue tape as i just used silicone to install the mushroom ledge.
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