cool, mine seems to be extremely photosensitive, if there is any light at all it will not move, and literally the second i turn off the light it begins to stir, i had the light off and left my room before, so it was totally dark in there, when i came home and flicked the light on in my room i saw it stuck to the glass, and it started thrashing around the tank wildly, smiashing into one of my sleeping peruvian rams!