Hydroid removal - Any ideas?

[pinkneyss]

How should I go about getting rid of these? From what I've read hydroids are hard to get rid of. Should I frag the zoas, save what I can & trash the rest? Anyone have any better ideas?

http://img.photobucket.com/albums/v108/pinkneyss/Temp/hydroids1.jpg

http://img.photobucket.com/albums/v108/pinkneyss/Temp/hydroids2.jpg