I've found a new critter nestled down in a couple of different zoa colonies. One of these colonies is doing fine, the other has been losing polyps. Tried to get a picture of the three I pulled off so far, but would have to go buy a better camera with a macro lens!

So, I'll describe it in hopes someone knows right away. I have had the pleasure of finding tiny white brittle stars hiding in a rock or coral that comes into my tank and that's what I had assumed was going on here when I first caught a glimpse of a tiny little leg poking out. These have black and white banded legs though, and there are only three legs. There is a central head with two very small antennae on the head. Whole thing is maybe the size of a dime when legs are outstretched, with the center head being the size of the head of a pin.

Any suggestions?