Do your research on them if you expect any chance of it living. A bunch of random info that i learned after buying one for my old reef tank (and it lived about two weeks)...
They are extremely sensitive. You need to find a healthy one (most will not be at a LFS
). Never buy one shipped, as there is just too much that can go wrong with temp and/or parameter fluctuations. You need to match your parameters almost exactly to where it came from, as they are ultra sensitive to even small variations. You need a very established tank with lots of growth or it will starve. They are beautiful, but most people can not keep them alive.