I'm planning to set up a new vivarium for white's tree frogs (1-2) and having never kept this species before, I could use some advice

My plan is to convert my current hermit crab tank (the 20 gallon on top in this photo, fire bellied toad vivarium is below). I'm wondering about a few details.
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First, heating. That tank currently has a large heat pad on one side and a ceramic heater above. With both of those running constantly and the room kept at a steady 21 C, the average temperature in the tank is around 27 C. Would it be best to keep both heaters? I wasn't sure about the heat pad and weather it is safe for a frog? I do have a thermostat that I can use to regulate its temperature. In the summer the room gets quite warm and I will be able to shut the heat pad off but right now keeping it warm can be a challenge.

Second, humidity. I am planning have a small pool, probably 1/3 to 1/2 the bottom of the tank, with the other side having a drainage medium covered in mesh and some ecoearth and moss which should stay consistently damp. With daily misting (by hand) should that keep the humidity in the right range? I could also install a small sponge filter or at least an air stone to maintain water movement.

In terms of other accessories I have ordered a couple of ledges to fix to the sides (a mushroom ledge and a planter ledge) and I'll be planting the tank (much like the one below). I was considering a waterfall or fogger but I hear both have their drawbacks. I am also thinking bark would make a nice background.

Thanks in advance for the tips. I'm going to move the hermit crab into his new terrarium tonight and get started on this project.