Food additions (coral feeding) Does the addition of food or target feeding SPS help in color change ? This is debatable. No, direct feeding of sps does not change the color of the coral. Yes, direct feeding of SPS helps relieve the dependency of the coral on it's zooxanthellae for energy, making the corals production of zooxanthellae less, thus making the coral appear a different color. SPS also absorb nutrients in the water column through the cell structure of the "skin". This also happens when the coral is stressed and it expels its zx or it dies off (not good). Browning" in SPS = Increase in CSD ("cell specific density").CSD refers to the number of zooxanthellae per host cell. This can be caused by high nutrients in the tank. SO just to make this simple... Color is NOT determined by zooxanthellae !
Ok this is getting complicated... What we really need is a IF-->THEN-->YES-->NO system in order to finally figure out how this all works.
I will work on that
Kasei