What is this?

[hecterma]

Hi, can anyone tell me what this is? It looks like a feather duster when it's in water.

Thanks in advance!

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[MurphyLong]

Could you perhaps circle what you're referring to? I see a bump on a frag plug...

 

[NeoReefer91]

I had something similar to that in my tank turned out to be a type of sponge keep a eye on it tho


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