What is this cool thing?

Tmr8188

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

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.
 

Mibu

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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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