HELP ID: What is this green thing in my cousins tank?

WilbyBakedReef

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Hello my cousin 40g breeder is doing great but I noticed these green things. Maybe a sponge of some kind?

2E627A45-C459-4A01-A93E-6D8F7A0F3F81.jpeg 13CBEBC7-5806-4B0B-8C5D-CF6710787E51.jpeg
 

vetteguy53081

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I see poriferan sponge and what looks like a grey smooth hound shark
 

A worm with high fashion and practical utility: Have you ever kept feather dusters in your reef aquarium?

  • I currently have feather dusters in my tank.

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  • I have not had feather dusters, but I hope to in the future.

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  • I have no plans to have feather dusters in my tank.

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