I wouldn't mind the xenia if you can attach it to anything well enough that it won't float off like the last xenia I tried to add.
Elegance corals should be placed in soft substrate (like
sugar fine sand), where the current is not strong enough to pull them out when fully extended. Poor water quality or sudden changes in lighting/quality can cause them to bail out of their skeletons, which isn't good but doesn't mean the coral is necessarily dead. They are very sensitive to soft coral toxins and can sometimes close for weeks to months without dying and come back out a different color, because they swapped out zooxanthllae with ones that do better in their current lighting. They also must be fed occaisionally to stay healthy.
Recent years has seen a severe decrease in the health of these corals being taken for captivity, possibly due to overcollection and a decline in the health of the reefs from which they are collected. The entire coral must be taken every time they are collected, as they are free living.
That's a summary of what Borneman has to say on them.
