My mom and I went in on a set of three of them together (1 for her tank, 2 for mine). I also purchased hermits along with them and so far they are living peacefully together (I didn't know hermits were interested in eating dusters). I don't have a camera readily available, but will try to get a picture posted soon. They are HUGE...probably 3-4" accross. My mom's is doing well also. Hope this helps!