Strange worm on LR

chiqui bb

Reefing newb
I haven't been able to get a photo of this thing because it's so small. I look at it with a magnifying glass.

It's dark purple or maybe black and comes out of the crevices in the rock as if coming out of a sheath. It appears to be eating something on the rock and as it's going back in, the tip turns white and looks like a feather duster but the tentacles are much shorter and thicker.

What is this??!!!
 
Nope. I have seen a few bristle worms on this piece of rock and it looks nothing like them. The entire length of the body is smooth and all one color.
 
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