I agree, that is way too much water. When you say a land area, are you referring to the large branch? I would drain the water and replace it with coconut husk or sphagnum moss. Both of these substrates hold in large amounts of moisture making them excellent choices for tropical species. I would put a shallow dish of water in there just big enough for him to fit into. Most of his water should come from misting as this is an arboreal species. I would also try feeding him crickets, as this is a more natural food.