Instead of dying, mine have been growing. It is possible to have success. The above link is a great one. I have one that looks like yours, but it has slightly receded from the center. Since my other 3 are doing well, I lean toward thinking it has to do with damage from shipping and the lfs tanks. I don't suggest keeping them in a pristine sps tank. I dose reef bugs or marine snow to help my pod population. I also have mad a mix with cyclopeeze (freeze dried), flakes, scallop, shrimp, seaweed, etc. and dusted them with it. They seem to do well in the same type of tank as gorgonians and others that need feed. The good news is that it is extending polyps some. Try feeding it. Good luck.