Can someone ID this for me?

[Evyllchyld]

Just want to know what this is???


Its on the far right in the first picture.

These pics are from this persons thread. (my favorite nano tank on RC that i've seen)


http://www.reefcentral.com/forums/showthread.php?s=&threadid=745652&perpage=25&pagenumber=1

 

[MCsaxmaster]

Briarium--green star polyps.

 

[The steven liu]

Those are green star polyps, they can grow like wild fire under proper conditoin. yours has a nice extension.