I just traded for some stalks of xenia. As I was mounting them, I found these two guys in the container. Before I add them to my tank, I was wanting to get more information about them. Can any ID them, and tell me if they are good or bad?
I agree with Trigga, they're banded serpent stars. I have several in my tank and they're about the size of a quarter tip to tip. they're safe for a reef tank just like other serpent stars