[Nancy, that came with my 55g last November, but in arranging the LR it was in the very back bottom, virtually out of sight and probably starved to the point of death.
When I was rearranging my rock a few months ago, I found that little gal hanging on for dear life, about the size of a dime and quite faded. I put it right in the front, and watched it grow as it caught food daily during feedings. Plus it finally got to enjoy some light!
It is probably 2" across now, and is really pretty entertaining.
If you'd like a larger copy of that shot, I have a 1024x768 image. I resize stuff for online viewing, but keep my originals. I need to back this stuff up!]