What is this cool thing?

tomxreef

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A126F7FC-8B69-4B31-9174-2DD7719BCDAC.jpeg

this showed up on an acan colony. Not sure what this is. Anybody have an Id?
 

kzenoni

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No clue but if you don’t want it I’m sure I can make room for it . Lol good score for sure
 

Mattyreefs

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Does it react to being touched? Would think if it's an octo it would retract. If it doesn't, dragon's breath is a good guess. Small seemingly seperate piece on the left makes more sense too if it's a macro.
 

Charlesbrooks

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I can't believe that this macro algae have you all stump!!!
This simply my favorite, the most beautiful, and the hardest to find....
nemastoma ssp.
Please let me know if you want to sale a piece.
Oh, please keep it far away from herbivores.
I would love if this algae become common place in the hobby.
 

Goaway

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I can't believe that this macro algae have you all stump!!!
This simply my favorite, the most beautiful, and the hardest to find....
nemastoma ssp.
Please let me know if you want to sale a piece.
Oh, please keep it far away from herbivores.
I would love if this algae become common place in the hobby.
I have never seen nemastoma. Amazing! Yes, protect that algae
 

Foneman02

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Could be a white sponge. Very aggressive and will cover coral . Having issues with yellow and a beige type. Had white which grew over the yellow. Had to scrub rock outside of tank.
 
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