Zoanthid pest

[Janh]

I bought a very small one a couple of weeks ago, it has been doing very well, in fact there are a couple of new heads on it already. Today I noticed it is closing up a lot, and tonight I can see something wandering around in it. It is very very tiny and from what I can tell, resembles some sort of worm. I have seen it come through the zoa's and touch one and then it closes. Any thoughts what this may be, is it just bugging them or eating them? How do I get rid of it?

I cannot get a pic, it is barely big enough to see and seems to stay hidden behind the zoa's. From what I have seen it does not look like a zoa eating spider or a nudibranch, but maybe nudibranches look like worms when they are that small.

Any thoughts or suggestions would be greatly appreciated

[Daimyo68]

Have a read through this old post, and maybe you can identify the pest:

http://www.nano-reef.com/forums/index.php?showtopic=136028

[Janh]

Thanks, I already looked through that site and nothing seems to resemble what I am seeing in my tank.

[thebkramer]

check these sites out :)
the sundial snail is a zoa eater.. the Eunicid Worm.. and the Aeolid Nudi also eat Zoas.. Hydroids don't eat them.. but def upset them..

http://www.xtalworld.com/Aquarium/hitchfaq.htm
http://www.chucksaddiction.com/hitchhikers.html
http://www.melevsreef.com/id/