Hi bro,
If I were you, I will remove them. The green stuffs could be bryopsis (nuisance algae). The white thing is a tunicate, may not suvive the cycling period thus adviseable to remove.
You may check out the below links for more info:
http://saltaquarium.about.com/od/liverockb..._curelrinaq.htm
http://www.liveaquaria.com/general/general...eral_pagesid=31
http://www.livestockusa.org/CURING.html
HTH