brown circle/patch on my live rock

[mrcopitr]

Originally posted by Jack:
Sam,
That looks like what I have, although patches of it are assorted small sizes(0.5-2cm) and they aren't in elevated scales... but I would say the small spots on my rock look like that.

Marco,
Mine is rusty coloured too.

What is that stuff?

<font size="2" face="Verdana, Helvetica, sans-serif">Hi Jack,

Mine are not elevated either, and after another inspection tonite, it is definitely expanding!!!
I'm also wondering what it is...

My emerald crab dont show any interest in it....I just hope that it wont be covering my live rock out of control....

Please keep me posted on your situation or if youlearn more about this..

as you mentionned we did get the same rock...it would be intereting to know if other reefers are experiencing the same problem...

Thank you for input...Marco