Another issue of "what's this?" - thank you!

[Mjm376bh]

Good day all, would you be so kind to please let me know what this sack like thing is underneath my coral? It wasn't there a few days ago...instead, there was a feather duster in that place...

Thank you kindly!

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[AlSimmons]

It looks like a sponge of some sort IMO. (harmless)

 

[Mjm376bh]

Thank you AlSimmons!


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[Dr. Reef]

Pineapple sponge completely harmless (well they can grow in numbers and clog plumbing.) They will decrease over time.