can anyone ID this yellow growth on live rock

Just started growing on a piece of rock don’t know what it is or where it came from. Its very bright yellow (same color as a yellow tang). Growing the most on the shaded area of rock. Only 25% is shown in photo. Really nice, just want to make sure its nothing bad.

http://www.flickr.com/photos/wime19/4818002637/

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can anyone ID this yellow growth on live rock

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