It's absolutely a Gorgonian. Are you considering getting this or do you have it already? Do you know what color the main stalk is when the polyps are retracted? Is it dark purple and has 'ridges' that run up and down the stalk?
There are both NPS and photosynthetic Gorgonians and they are split just about even between the two. Based on the photo you posted, there is no way anybody can be positive about an ID as to which specific Gorgonian it is.
I have both in my tanks. The NPS ones are a bit of a pain and are much harder to keep alive. The photosynthetic ones are pretty easy. They still like to get fed occasionally as a lot of them come from shallow reef flats where the water quality is lower and there are more nutrients in the water. I collected mine in the Florida Keys while snorkeling. There are so many of them that the state allows license holders to take up to 8 colonies in a day, as opposed to only 5 polyps of zoas or softies and ABSOLUTELY NO stony corals and NO live rock.