Elegance corals used to be a staple back in the day, and would live a long time. The problem with them nowadays is that most, and by most I would feel safe betting 90+% of them come in with a bacterial infection. Almost always meaning certain death.
IMO, and I exported corals for a living from the source, Elegance are better suited to staying in the ocean and not our tanks.
They aren't handled well usually at the source/ in transit and succumb to the aforementioned bacterial infections.