Imbellis' are awesome!! I have decided that I am going to start two more 10 gallons this summer. The one I have right now will remain a community of tropical fish, the second one will become a sorority tank, and the last will become one just for imbellis'. My LPS sells Metallic Imbellis and they look awesome because if you have light in the room, they shimmer. Its also great to watch the tank when you have a bunch of em in there. I am not going to have a tank with a male and female. As you all said, it is a bad idea. And I knew it was, but it seemed like they were getting along, but its true...one day they could go crazy and kill one or the other. =) Thanks!