What is this?

[tony_3a]

I have this stuff all over ONE of my live rock pieces, i have no clue what it is.
http://i796.photobucket.com/albums/yy246/tony_3a/IMG_6726.jpg

another pic.

http://i796.photobucket.com/albums/yy246/tony_3a/IMG_6697.jpg

Also what algae is this???

http://i796.photobucket.com/albums/yy246/tony_3a/stuffonrock.jpg

Thanks a lot guys!!!

[Atomikk]

The first picture is of a specific fine type of algae. Most herbivores would eat it. The second picture is of a common mat type of algae. Most snails would eat it.