https://apps-nefsc.fisheries.noaa.gov/nefsc/ecosystem-ecology/corals.html
Ecology of the Northeast US Continental Shelf

Deep Corals
Deep corals are living members of some benthic communities, but are also structural elements. There are no known coral reefs in northeastern U.S. waters. However, various growth forms of coral do afford some spatial complexity to habitat spaces in the region in both shallow and deep water. Corals are not unique in this regard; sponges, hydroids, anemones (solitary and colonial, fixed and burrowing), oysters, mussels, jingle shells, and tube-building worms and amphipods serve similar functions in habitats where they occur, often defining the character of the benthic community and providing cover for resident and transient fishes. Deep corals are suspension feeders, but unlike most tropical and subtropical corals, do not require sunlight and do not have symbiotic algae (zooxanthellae) to meet their energy needs. Deep corals can be found from near the surface to 6000 m depth, but most commonly occur between 50-1000 m on hard substrate, hence their “deep-sea” appellation. ...