What is this???

Brittany Boorman

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I came back from a long weekend away to find this covering my coral. What is it??? Will it hurt my Zoas and how do I get rid of it!?!
 

James M

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Cyano, It can smother the zoas to death if not taken care of. You can put the frag in front of a Powerhead to get it off
 

Ingenuity against algae: Do you use DIY methods for controlling nuisance algae?

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