I was thinking this guy.....
RANDY HOLMES
http://www.reefcentral.com/forums/me...fo&userid=3491
Maybe he could answer some questions as to why the colors change under different parameters for all corals and specifically what causes the specific colors. ie if my coral goes from green to yellow is my symbiotic algae dying and a new color of algae growing in it's place or does algae change color as we do with tanning? Just curious.
Ed C