Is this a good thing growing on my live rock?

[RPatsula]

Hello, I have no idea what this stuff is that is growing on my live rock. It is an green leafy type of plant I think. I think it is no good so I'm going to pull it out with tweezers but I wanted to be sure first. I've come to the conclusion that if anything is growing out of my live rock it usually means it is bad because I have had no luck with good hitchhikers.

Thanks
Rick