Hi xjiahua,
I would recommend you using artificial grass as I'm using it now for my horde of white tree frogs. The poos of the frogs is literally almost the smell like soil. However, Please do not be so worried about the poos just add misting system to clear the poos and also refreshes your white tree frogs, too.
Let me know how are you going to set up your paludarium? I may be able to help you with your newly set up.
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