The Japanese researcher Kawaguti published two papers on coral coloration back in the 1940s. He speculated (correctly) that light was a major factor, but also reported that temperature, hydrogen peroxide, and (if memory serves) pH affected color. Very interesting works but the devices available then simply do not compare to what we have today. It is my intent to repeat his experiments in much more detail.LOL. Is it correct for me to assume that lights (the whole bunch of details about lighting) is the culprit for color mismatch?. My sps corals is a mixed of wild sticks, from tidal line (2 - 3 feet of water at lowest tide) to several meters deep (roughly 10 - 20 meters) so the light changes are quite dramatic as compared to 18" deep tank.