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Cocoon on live rock

post #1 of 4
Thread Starter 

I have a cocoon like growth on my live rock, originally thought to be a sponge; today there is a hole burrowed in it.  Can anyone tell me what it is?  The attached photo is blurry, but you get the idea.

 

 

s?263

post #2 of 4

Still think that it's probably just sponge, it might just be starting to break apart.

post #3 of 4

Yep. Agree. Sponge.

post #4 of 4
Thread Starter 

Thanks, that makes me feel better!

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