It looks healthy to me........im not sure if the color it appears to be is really its full potential, but it appears to have good
polyp extension and growth on all of the edges. Thats the sign of health IMO for any stony, is the polyp extension and always growing. Getting the most color out of them is the next step.
To be sure, that very well might be its true color. Can you get a closer pic???
When they get white down inside it can be from just less light getting there or a shadow or even if sand or something sits on it they will get whitish in those spots.
