OK, but the poster did not just say "good luck". What they said was If they do not believe the sand is a good place for it (as evidenced by the context of their post) then, they think it will die in the sand... It is kind of like saying "Go jump off a bridge. Good luck with it." Are you saying that the internet is not a good research tool? I suppose that it may be possible that someone who collects these animals or spends much time in their habitat could answer the question... and I believe that they could either post on the internet, OR be quoted on the internet as saying such. Most of the links I posted were articles. The pictures are supplemented to the articles. I am not posting just pictures. Please read the articles. If you wish to remove yourself from the discussion, then so be it. I am not looking to argue or make false claims. I posted a statement that I believe they should live in sand. You posted without much information backing your claim as a response in disagreement with my post. I posted a reply, with a few articles, including one by a well respected marine aquarium writer and zoologist. If we can't use the forums for healthy discussion, whether we agree or disagree, then what are they good for? I would seriously like for someone to show me good evidence that Heliofungia actiniformis should live on rocks. Other than a few pictures of specific species (that are not Heliofungia actiniformis) no one has produced any real evidence to support the claim. Telling me that you had an animal for two years in the sand and then it suddenly dies does not support the claim, either. You could use the same cause/effect relationship to say that just because you had the animal in an aquarium for two years it died.