What is this Stuff?

[idog]

This Green stuff is growing on the underside of one (and only one) of my rocks. No light reaches this stuff. What is it?
thanks

http://i69.photobucket.com/albums/i59/idog3344/Picture056.jpg

 

[AlexfromSATX]

Is your tank still cycling? It looks like die off from the cycling process.

 

[Jennie]

Looks like an encrusting algea, most likely green coralline.

 

[cbianco]

That is a piece of live rock

JK I couldn't help it...

Various algea and what looks to be die off as mentioned earlier.

Christopher

 

[idog]

Yeah my tank is still cycling. The green stuff is quite hard. Doesn't green corraline need light to grow?

I shouldn't be worried though, right? This particular rock is a little stinky. Smells different than my other rocks. There probably is a lot of die off.

 

[phreebsd]

Agree with Jennie, definitely green coraline.

 

[Anonymous]

Looks like green coralline to me.