What is this on the side the side of my torch?

[Twodogsnnc]

Strange white growth with almost hair like things coming out the end... is this part of the coral or a hitchhiker. I have dipped num

erous times in bayer and coral rx. These photos are post dip so the coral is retracted. Any thoughts? #reefsquad

 

[Tahoe61]

Sponge and harmless.

You'll find the ID at the link

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