In my 29gallon I have just the 2 NO bulbs. I started growing HUGE circles of coralline on the back wall and they were almost a light green color, after a few months now I have noticed they turned light pink/purple in color and are spreading like crazy!
I don't think lighting plays into as much as your calcium does.
God grant me the serenity to accept the thing's I can not change, the courage to change the thing's I can and the wisdom to know the difference!
R.I.P Walena K. Cox
7/7/62 - 8/11/2002