ID please

I am fighting a sponge on the colony now, I did a freshwater dip to kill it off hopefully whatever this thing is survives.
 
Here are some more pics of it, it is doing well after the fresh water dip:

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You can see it closing up in the last pic, it seems to be more light sensitive than the zoos. Any thoughts on what it is?
 
this is a great example illustrating how mellow zoos are around many corals (I've had them touching Montipora digitata, Turbinaria reniformis and frogspawns without incident)
 
So should I try to relocate it or should I leave it be? Any links to info on it would be great as well.
 
Cool - Thanks for the help. There are actually two of these on the zoo rock, hopefully they will relocate somewhere visible.
 
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