Brown Fuzz on Rocks

[danriek]

Could any help me to identify the brown fuzz on my rocks. This stuff is growing every where. On snails, crabs shells, and my live rock. You can see it on the edge of the rock in this picture. I would like to get rid of this stuff since it makes my tank look dingy.

 

[hefner413]

i've got that stuff in places, I always thought it was just some sort of algae. seems as though my tang eats it though.

 

[killersnake0]

I have that too. can't tell you what it is though

 

[cpg]

I have this in my tank also. I would love to know what it is and what causes it?