Aptaisia or polyps?

[ShootinBlanks]

I was looking around in my sump tonight and found a rock with these on it. The rock has several all around it. I don't believe these are aptaisia or at least the ones I have seen, but what do you think? They look similar to yellow polyps to me. What do you guys think...main tank or not? Thanks

 

[aquarist=broke]

zoanthids

See info here about half the page down: http://www.reefs.org/hhfaq/pages/main_pages/faq_rock1.htm

 

[ChrisRD]

Definitely zooanthids, not aptasia.