They're very small, a few millimeters across, i had to take this with an underwater camera in macro mode.
<iframe title ="Preview" scrolling="no" marginheight="0" marginwidth="0" frameborder="0" width="320px" height="240px" style="padding:0;background-color:#fcfcfc;" src="https://skydrive.live.com/embed?cid=8C7D65758E653733&resid=8C7D65758E653733%211700&authkey=ADMvvx27W8boDKc"></iframe>
To give scale, the area around the tort coral is completely covered.
<iframe title ="Preview" scrolling="no" marginheight="0" marginwidth="0" frameborder="0" width="320px" height="240px" style="padding:0;background-color:#fcfcfc;" src="https://skydrive.live.com/embed?cid=8C7D65758E653733&resid=8C7D65758E653733%211701&authkey=AKRItaIaIp6YiSk"></iframe>
<iframe title ="Preview" scrolling="no" marginheight="0" marginwidth="0" frameborder="0" width="320px" height="240px" style="padding:0;background-color:#fcfcfc;" src="https://skydrive.live.com/embed?cid=8C7D65758E653733&resid=8C7D65758E653733%211700&authkey=ADMvvx27W8boDKc"></iframe>
To give scale, the area around the tort coral is completely covered.
<iframe title ="Preview" scrolling="no" marginheight="0" marginwidth="0" frameborder="0" width="320px" height="240px" style="padding:0;background-color:#fcfcfc;" src="https://skydrive.live.com/embed?cid=8C7D65758E653733&resid=8C7D65758E653733%211701&authkey=AKRItaIaIp6YiSk"></iframe>