Hitchhiker id???

[Flatbrook]

Hello everyone, anyone have any idea what this might be on my liverock? It is about 4 inches long and looks like strings. I don't believe it is still alive. It has been there since I got my LR about a month ago.

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[ritter6788]

Does it come from a hard spiral tube?

 

[Flatbrook]

Not that I see. Looks to come right out of the rock itself.


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