I had a peanut worm and it only extended at night, late at night. When the light would hit it, the worm would retract with amazing speed so it took a while to figure it out. If you can set up a small (not bright) light so you can see into the area where it is and check on it a couple times after lights out you may see what it is. My peanut worm would extend out almost a foot and feed like an elephant trunk but like I say, when it retracted, it was almost instant.
Douglas
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