What is this?

Jenn74

Reefing newb
Our tank is only a few months old and its our 1st saltwater. This is a piece of LR we purchased from our store we got all ours from. This started growing from it a week ago and is growing fast. What is it?
2014-07-11 09.30.32-1.jpg
2014-07-11 09.30.32.jpg
 
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