foster,
i think intense light is not as needed with the digi. i doubt they are picky with current either. However, with a sps tank, you should try to run good current throughout. Color Variations: green, orange, and purple are usually the more common ones. The ones less common are green body with orange polyps, lavender body with green polyps, and blue body with red polyps. Growth pattern may be dependent on current too. hope this helps...