ID please?!

[kyledf]

Hi I have recently bought live rock from some one there was one of these on the rock now I see two of them not sure if they're bad or not. They seem fixed in one spot though Info would be great so I can do some research. Thanks In advance.http://tapatalk.imageshack.com/v2/15/02/18/7c5f309ba64d28450a6c046dde9e19d6.jpg

[kyledf]

http://tapatalk.imageshack.com/v2/15/02/18/c72e2fabf1fed8a99960bb703fc4680e.jpg bit of a better pic

[Calappidae]

Aiptasia? Not exactly sure what you're refering to.

[Betta132]

Does it withdraw quickly if startled? It looks like some variety of fanworm hiding in the rock.

[Nina51]

looks like it could be a ball anemone.

[Sugar Magnolia]

It's a harmless fanworm.

[sam.basye]

+1 everyday fanworm

[Fish Ed]

Looks like a fan worm. Just to be sure, does it go in and out?