Help with 1 week old 10g nano

[Nixon]

uh oh, i've just discovered i have some Digitate hydroids in my liverock. are these going to be a problem. i read up a bit on them, and some sites said that they sting anything they can touch. i'm going to be placing coral in here in a few weeks time. will these harm my coral and if they will, how should i go about getting rid of them? thanks guys. yo'uve been a huge help and i really appricate it! great support on this site. i love it!