Gorgonian - Pseudoplexaura sp.
This coral is from the 20,000g reef at the Long Island Aquarium & Exhibit Center. This piece in my reef started from a 4" frag in 2012, and hasn't been directly fed. As a photo-synthetic coral, it aquires some nutrition via lighting while the polyps trap any food moving in the water column. The parent colony has been in Joe's care for over 25 years, and huge colonies 4'-5' wide can be seen in his reef.
As of 2016, my little colony is over 16" in size with many branches.