I started using the red sea coral color program last year. Iodine for pinks, potassium for reds, iron for green, and trace elements such as gold for the blue colors. I even bought the coral color multi test kit to test for iodine, iron, and potassium. The corals looked great, but I would not attribute that to red sea's additives.

I've always felt stabile alk, ph, calcium, temps, and lighting were more important to the the look of the acros than my levels of gold. I still use the red sea additives, but mainly because I do very little in water changes and want to replace the depleted elements in the tank.