I found them under overhangs when I was exploring the reef platform at the southern shore of the island. These animals don't rely much on the symbiotic algae in their tissues for food production. Thus they can live where it is not really well-lit in the sun. They rely on the strong currents to bring them food.
Taking their photos was really a challenge to me because of the waves. They were just a foot or two below the surface. I had to be careful and hold on to whatever I could so that the waves won't push me into the reef surface. (It must hurt!) But also, the light conditions were really not that good. It was one of those moments that I hoped I was diving instead, and could stay underwater as long as I want and find the best positions to take those photos. Anyway, despite the poor image quality, I don't blame my camera or its owner. They tried their best!
Gorginians have calcareous spicules in their tissues for support. However, they also have a kind of protein called gorgonin in their skeletons, hence their rigid but flexible branching structures.
These are surprises to me! I only knew that there were brittle stars in the gorgonian branches when I came home and looked at the photos in their actual size!
Well, yet another reason to return to the same spot with my camera again!