Best thing to do is remember that in the long run, if it's a coral reef tank, that rock will mostly be covered.
Most of your purple is on your rocks themselves. Best thing to do is remember that in the long run, if it's a coral reef tank, that rock will mostly be covered. It provides the skeleton to the outside. Try to concentrate more with coral coloring in the reef. Yellows would work if you are not going to fill the tank with coral though. :wink: