arminkropp
Aquarium Advice Freak
Came across this and figured I'd share it. Very interesting.
http://web.archive.org/web/20010303...om/fish2/aqfm/1999/mar/features/1/default.asp
http://web.archive.org/web/20010303...om/fish2/aqfm/1999/mar/features/1/default.asp