Need help identifying algae

[TLM]

Some of them are covering my green star polyps. I tried to pull them out but it wasn't easy. Still got some left on the polyps. Is there anything I can try or do beside pull them out? Thanks again!

[fkshiu]

Hydroids are not easy to remove as they can come back no matter what you do to them. The only foolproof way I've found is the ol' hammer and chisel. I have also heard of people blowtorching them.

[Myka]

Sounds like you'll have to sacrifice some GSP. Hydroids can be a real pain in the butt to get rid of. I suggest removing any part of the rock that they are on, plus an inch around them.

[Matt]

Don't panic unless they're spreading rapidly. I've had a patch come and go without doing anything except fretting.