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Glass tanks with their mesh lids tend to be more difficult to keep proper humidity in, especially during the dryer winter months. You might want to try covering most of the mesh lid with something like Press n Seal and just leaving a bit of each corner open for air exchange. Also you could add in a second water dish, on the warm side if you have room, that is low and wide allowing for more evaporation in the enclosure. Some people use dampened spagnum moss here and there in the enclosure to promote more humidity.