Jewells
Member
The past month I thought these where hydroids, I just found out today it is a vermetid a type of snail. Here is a link I posted that has a picture and some info.
http://www.reefsanctuary.com/forums/general-reef-aquarium-discussion/57535-hydroids.html#post786790
http://www.reefsanctuary.com/forums/general-reef-aquarium-discussion/57535-hydroids.html#post786790