Help w/ Bug ID on M. digitata

archipelago

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Purchased this coral frag today and found these while scoping as part of my pre-mont inspection.

There were about a hundred total on the 1 inch frag. Most specimens seems to be crawling around the coral - I did not witness anything that appeared to be feeding, except for the animal in the first clip in the vid below. It seems to have buried itself (head first) into the corral polyp, then appears to lay an egg on the outside ring of the coralite (?).

The animals are translucent, appear to have a shell-like formation on their back. This 'shell' has a redish design on it.

Has anyone seen these before? I couldn't get an ID during a cursory google search on digitata pests, so tossed the frag.

 

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