I don't get it too. I had those stand along round goniopora before and they don't last through 3 months. About a year ago, I discovered a piece of my LR has some encrusting green goniopora start growing on it! Till this date, it has already grown from 3 polyps to almost 30 polyps, maintenance schedule unchanged, except I went skimmerless about a year ago. Some said the encrusting type fares much better in home aquaria. I don't know. I don't know why the store bought ones never worked for me and the one that grew out of nowhere is thriving. :? :?: