ID please

This one has me baffled. It's very light pink, and it's growing on my yellow zoanthid rock. It touches some of the polyps and doesn't seem to bother them. It's coming from the underside of the rock. At first I thought it was a worm. I took my grabber and pulled part of it off the rock. It didn't retract or anything. It almost seems like some kind of root? There are actually two of them on this rock, the second one is hard to see (well, so is the first one, but you know...)

unidentifiedthingtb0.jpg
 
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