We had no luck with having a linkia star either. He disappeared in good health amongst the reef scape and we've never seen him again. All I can say is that the hermits & other members of our cleanup crew did a heck of a job with it's remains because we never noted any changes in our water tests that would indicate a death in the tank. He was a big guy too. At the LFS last week we noticed they had all the linkia's in the back room... kind of out of sight. They all were dying or dead. Pitiful! Sorry for your problems with yours. I hope the store will do something for you!