Flat Worm?

[RMS18]

Hey guys, just opened up a new Coral from a shipment today and saw these brown dots moving on the frag plug. I put one under the scope, what am I looking at here? I inspected the coral which was a Digi, and see no bite marks.

Thank you

 

[RMS18]

Video of the little guy

 

[RMS18]

I was given confirmation these guys are good guys and pose no harm to corals. Infact can be coral or fish food.