Tiny critter, probably too small. Wormy thingy

[crazypants]

Any idea? Polychaete? It’s a baby thing, whatever it is. I was contemplating removing it but after the video it went for a swim and landed in the rock work. I understand it may be too small and featureless to ID. Thanks!

 

[crazypants]

Strange, it’s not playing, at least not on my phone. Trying again