Ha! You mean the ThorTek David, ya? I know this guy well. He offered me a lot of information about their products. He is nice guy!
Zoas being kept in my 50gal tank are quite well on coloration and growth. I like how they look under blue LED light. You will find your corals so amazing under the blue. I have read some articles talking about the influence of lighting spectrum on corals' coloration. Blue light is essentially important to most fluorencent proteins. Fluorencent proteins absorb shorter wavelength light (higher energy: UV, blue, green) and emit longer wavelength light (lower energy: yellow, orange,red). And that is the main reason why we can see those color of corals. Most of corals can absorb blue light and emit lights of different colors. In my personal opinion, I think to provide sufficient blue light is quite important to make corals colorful!
BTW, addition of iodine and dilute honey (yes, those produced by bees) soluion is found to be helpful and efficient on maintaining the color. Sufficient amino acids which are the basic sources to build up a protein canbe found in honey. You can try to add to see if this method works!