nah just the water is fine. I don't put anything in my false bottoms other than water and Air.
You will want to cut some notches in the bottoms of your PVC supports. Water will drain from the soil down into them and if there is no way out you will end up with stagnant nasty water in the supports, 2 small v cuts is enough.
The Sphagnum above the soil is amazing help with the humidity as well as keeping your frogs clean when they venture the to substrate.
If you wrapped the egg crate in fiberglass screening that would be fine. I would be worried about the frogs escaping through the egg crate if it wasn't wrapped in something. A roll of fiberglass screen at a Home Depot or Lowes is very very cheap. You might even be able to get some glass cut for the top (cut it small to leave room for some ventilation) cheaper than you can buy the egg crate for. You don't need anything super thick. Though for your size of tank (unless it has a brace running across the middle on the top) you may want to go with 1/4' glass just to make sure it doesn't flex to much.
I would do the cut glass and then the egg crate wrapped in screening for the top. You will need to be able to open the top to feed them and clean the tank so having some or all of it removable will be key.





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. Can you post a pic of the vine? I doubt this could happen to anybody but me but i found a great brach once! (Poison ivy) not fun 
