I went away on Saturday, and came home on Sunday, and it was gone. The tank is acrylic, and has a major overhang on the top, so I would think it would be hard to jump out. I haven't found a body, so I am pretty sure it was eaten. I don't know if I will go back to the LFS that I got him from. He told me it was something else, and also that it would get to 10". If I knew what it was, I wouldn't have risked it.