wow that does not look good at all.
I am not an expert but I would move it closer to the light and see how it goes.
Look here is my observation with mine if it helps - I have a fairly large rock with three sides (top and two sides)covered with this coral, I would say there are at least 25-30 eyes on it. The top which is under direct light is green & growing and the sides which doesn't get much light does not look healthy at all (like your one in the photo). So I came to conclusion that light is not too bad for these guys.
I also noticed when the purple bits turn greenish colour under high light, the green colouring moves towards the center in time and make the green eye bigger so this is the way it grows I reckon, which also explains why the edges near bare rock are green - it is expanding its borders.
As I said I am not an expert , I am fairly new in this hobby but I would def try increased the lighting.
I feed mine reef roids twice a week btw and it loves it.