Fuzzy rocks

[bromion]

On the 3rd day in my tank, there is white fuzz on some of my live rock. It is growing in patches, and looks like moss (but white) or cobwebs. I have linked to a picture, which is as clear as I can get so far. Any ideas on what this is?

http://www.cds.caltech.edu/~jasonm1/pictures/fuzz.jpg

 

[Fluff]

Looks like die off. Pretty typical in with newly added live rock. It could be caused by sponges and such dying off.