Free rock with palys

It's a little larger than softball sized and fairly round. It's a rock that's from a tank established in 2004 so it's go some good life on it.

 
No clue. They came in a tank I purchased from a DR who closed his practice. My tank is moving to primarily a sps tank so they need to go. Originally I just kept them in my tank along with a bunch of other rocks and stuff from the tank I broke down to help seed my young tank. Now that my tank is a year old it's done it's job and time to move on.
 
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