After some contemplating and a little more research, I finally gave in and bought one. It is maybe 4 inches. When I put it in the tank, it hid behind the heaters, so I replaced the one glass one with another stealth heater so it wouldn't get heater burn, but when I got back, it was laying in the front of the tank and ate shrimp as soon as I threw them in there. Anyway, here's a crappy pic:

