Aquarius Home of the World's First Underwater Web Site. You can download the software you need to view images from Aquarius, an underwater research lab. See what the scientists see, both inside and outside the lab. Also, archives have pictures and video. Click on the picture to view the lesson.
Some people are interested in growing coral in their fish tanks.
If you are interested in coral, this site has some good timed photos of coral growth in a tank. Lots of information on the hobby. Live action shots from a fish tank. Great animation as well. How the animations were created is interesting.