Hitchhiker ID please

[Wheelman76]

The first one came on my live rock and is encrusted on the rock

http://i1073.photobucket.com/albums/...4A2417AA7B.jpg

Here is another pic of it with another hitchhiker beside it coming out of the hole in the live rock.

http://i1073.photobucket.com/albums/...4A21681A51.jpg

And lastly these hitchhikers which I have in a few different spots around the tank, each head is about the size of a pencil eraser.

http://i1073.photobucket.com/albums/...4A1D68BD81.jpg


Any help would be much appreciated.