Coral fragging can be done with great success providing your system is mature enough. If you want more info on frags go to garf.com or search for aquacultured corals online. I prefer the natural way and haven't fragged any of my corals though I have been tempted to try it with my mushrooms. Haven't found any need since they are reproducing nicely on their own. My pearl bubble sprouted a new head and my hammer split one of its' heads. My mushrooms, button polyps and star polyps are spreading out like crazy.