Does anyone know how to precisely tell these apart. I have what was sold to me awhile ago as a green sinularia and it has grown, been fragged and lived a happy life. I have seen pictures here and elsewhere of people selling Nepthea and it looks identical to what I have so I was wondering what the method to know is?? I dont care as what I have is a really nice piece and has better green coloration than in these pics but its more of a curiosity question