Yeah, well, I did the "point and purchase" thing again ... what is it? It's about 4" round, green-ish - looked real healthy when I got it, but now it's starting to turn brown on one side. Maybe my lights? I just moved it from my 60g to the small nano with the Met. Hal. lamps ... maybe that'll help. My buddy thought it might be a Pineapple Caulastrea - ?