Hmmmm.... Zoa's don't move around unless it has broken free. Try to get a picture. See if your camera has a "macro" mode on it. It will help your camera's auto focus work better on a close up shot. Also might help to shut off the pump for a little while when taking pictures. You can also move the rock closer to the glass to allow you to take a better picture. Then move it back when you are done with it.