Thin, brown tentacles?

Res_Ipsa

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I was inspecting my rocks after discovering a lone majano a couple days ago and noticed these long, thin, brown tentacles with black dots on them coming out from a small piece of my rock.

When hit with a small blast of water, the tentacles retracted inside the rock. I was able to move a small piece of the rock out of the way but can't tell what this is. Any ideas?

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