Thought I got to this one already. My post must have not gone threw. Or I am loosing it. Both are possible.
But anyway, this is a soft coral. If this is a tan colora and has been surviving under your reef lighting well, then it probably is a Capnella species (aka Kenya Tree). If it is that bright orange color depicted in the photo, then it could be a non-photo coral like Dendronephthya (aka Carnation Coral). Which is near impossible to keep alive long term.