If I remembe right N. gracilis is epiphytic and stays small and viney. I mentioned in a post earlier I had thought of it. I didn't reall like the look of the pitchers but then I seen a white one and it would look cool, very contrasting in the terarrium. I have alsmost pinned down N. ampullaria and N. gracilis. I have a floor space open and the other space is an epi spot. I also added 4 different lichens to the tank, it already was growing some but I helped it and added variety.