Polyp in live rock hole

Finnjävel

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Hi all.

Found this 5mm diameter thingy on live rock piece in my sump. It lives in hole and retracts when pointing it with light or when opening sump cabinet doors.

Maybe majano but it doesn't look like that. It's something 10mm long. And after giving some light it almost disappears.

IMG_20211206_095536_edit_41836819422782.jpg
 

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

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