Id? Egg sack on live rock

Nlm124

New member
Tank has recently been cycled and all parameters are good. Got about 5 or 6 of these things all attached to the rock. Any thoughts?
 

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I have the same exact thing (has been there for over a month now) and have no idea what it is. Hopefully somebody else chimes in.
 
The tentacles appear to be holding the egg sack against the rock. Here is mine (sorry, crappy cell phone pic)
 

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