Sniperhank
Giant Clam Addict
Here is a simple explanation from one of my favorite magazines as a kid, Ranger Rick, regarding the relationship between clownfish and anemone.
http://www.nwf.org/Kids/Ranger-Rick/Animals/Fish/Clownfish.aspx
http://www.nwf.org/Kids/Ranger-Rick/Animals/Fish/Clownfish.aspx