If you do much research on these corals you will see that the average reef tank is not a suitable home for them. Elegance corals are typically found on mudflats or back water lagoons. The water in these areas is full of debris and particulate matter. And as such light penetration in these areas is not as great as on a reef crest. Most people setup reef aquariums to replicate reef crest environments. That is, we have large amounts of rock, high flow, and very "clean" water. Unfortunately, these amazing corals are not typically found in areas such as this. They are usually found sitting in the mud. These corals must be carefully adjusted to high light conditions. Since they come from more turbid waters, light penetration is far less than in areas of clear water. I have read many cases of these corals experiencing polyp bail out, which usually leads to death.
Also, since these corals can adapt (are adapted) to low lighting conditions, it should be understood that they rely on outside food sources. So regular feedings are very helpful.
So in short be sure to adjust slowly to high light. Feed regularly. Place the coral on a soft substrate (not rock). And be sure not to blast it with heavy water flow.
~Michael