Need help to id this brown polyps

[Maple55]

I am a newbie and has a 55 gallon tank for 1 month. I got his brown polyps spreading to all live rocks. Are they bad? How to keep it under control?
Picture link: "i791.photobucket.com/albums/yy197/maple55/brownP2.jpg"

[Fat Tony]

Thought I'd help you out.. I can't really tell of hand personally.. maybe hydroids or some other zoanthid.. but here's the pic for you

[Maple55]

It's green center with brown tentacles. Some get up to 1/2''-1" tall with the lights on. It spreads to all rocks, sticks on glass, pump, and pre-filter. Is there a way to control them?

[Jadinop]

Hard to tell but my guess would be a type of majano anemone. They come in a few different shapes and sizes, some are more colorful than others. I have seen the ones you have before and they spread like wildfire.

[Maple55]

Jadinop, I think you are right. I believe it is a type of majano anemone. How do you get rid of them? I put a couple Peppermint shrimps in. Hope that would help.

[Reeftanker3295]

I think peps only eat aptasia. You can try kalk paste, theres a good thread on how to make it on here