Try here and see if this article helps you!
http://www.rshimek.com/cnidaria.htm
FSU, That's them at the very bottom: "nasty" regular hydroids.
I'll try some paste on some and maybe try peeling off other colonies.
Eric
Hey good link, thats what I have as well. They are small but from what I read they still have a strong enough sting to irritate some corals.
GaryP- yes I know man for every one of those aptasia i killed there are two more somewhere that I cant see. It really sucks because LFS in Odessa does get in some really nice looking coral but his coral tank is more infested with aptasia than any tank I have ever seen. I dont buy from him unless I am desperate or unless he has something really really cool looking or really really cheap and that has only been one time, still one time too many as now they are infesting my tank as well. I bought a near dead branching pink/green hammer coral from him that had one little piece of tissue left on it for $3. It is doing great and has tripled in size in the last month but now I have the aptasia problem. My question is will my blue cheek trigger or lion eat the Berghia? Worth a try I suppose, but will email them and ask that question before I get any.