what is this growing on my live rock

[intemidator3]

Can anyone tell me what this funky looking thing is growing on my live rock, it started out as what looked like a tiny redish paper thin leafy looking thing but now has grown rapidly into about the size as a soccer ball. I have never seen this in any lfs or in a book. This thing has multiplied in around 2 months to this size. Its attractive as the leavy looking things flow back and forth with the current, I felt these leavy looking things and they are slimy to the touch. Could someone please help in identifing this creature.

 

[thereefman52]

Im not positive, but my guess would be some type of macro algea. Im guessing this because of you fast you said it has grown.

 

[artskoi]

I saw what you are talking about in my LFS.It was like a rust red color flowing paper attached to a blue mushroom rock.I asked at the store and they said it was a macroalgae.I wanted to buy but they said as a macroalgae it would probably be eaten by my Purple Tang.

 

[thereefman52]

HAHAHA i AM good!!! hehehe jk! hope i helped

 

[intemidator3]

Is this a good algae or bad? Also I have a blue tang in the tank and it never has attempted to graze on it.

 

[thereefman52]

Macro algea is very good. It is good that herb. fish like to eat it (i guess he tang doesnt like that kind, my tang LOVES when i give it macro algea.) but it also used Nitrates in your water, then lowering it