^^Good advice sqwat;
braddufrene: You said yourself the difference right off the get is that it came from a tank with half the lighting, being sensitive as you've witnessed it yourself it would be in your best interest to gradually introduce it to more light, if that is what you desire, but for now I'd keep it on the bottom in any far corner. This is where the lowest levels of light are and will be your best bet in light acclimation.
Shortening light cycles, turning bulbs off, etc. is still hard on a coral! It seems logical if you dont think about..But if you give it some serious thought it is NOT!!

I refer you to Anthony Calfo's Book of Coral Propigation regarding light acclimation if you'd like to read further on that particular subject. The best form of light acclimation is through screening, not always the easiest, but the best method.
You pound any coral with more light than it's use to or, beyond it's saturation point and your going to see that coral retract, shrink, close, etc.
Also make sure your not giving it more wammies than one, alk being a primary contributor to Pi$$ed off corals. You keeping your tank at 8 seems good right? Corals seem happy yadada, but what if the LFS's alk is at 10 or 11? You'd see exactly what your seeing now, let alone compiled with more intense light would be a perfect storm to kill a sensitive trachy :twitch:
Back to the lighting, always better to error on the side of not enough light. Much easier to color up a faded or drab coral, than a bleached transluscent white one!

Good luck! Hope to see a picture of a healthy red open brain in a month or two :thumbsup:
-Justin