I need to get a lil humidity in my Curly's cage. I live in South Dakoka and we have very low humidity here. Would this work? Fill the bottom of the cage with fairly large gravel about 1/2 inch high. Then add water to that height. On top of the gravel put my potting soil on top of that about 2-3 inches. About once a week add more water. Would this work ok? If not please give me a few ideas.