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Hi guys,
I bought a red tree sponge and this was attached to bottom of it. Does anyone know what it is? The LFS said it was an illegal coral to keep captive.. Sorry this is the best picture I can take..
It is harder to ID individual polyps but I am fairly sure it is a Boulder Star Coral - Monstastrea annularis or Great Star Coral - Montastraea cavernosa both native to the Gulf of mexico. Not illegal at all, though they may be illegal to harvest depending on location. They are actually common hitchhikers on Florida aquacultured live rock. With luck it will grow into a nice colony. It almost look anemone-ish with the soft clear tentacles. I have several and think they are rather cool.