wow, thats crazy.. it ate a whole anchovy. I think that the guys pet, i didnt see any thing else it the tank. This is why i have coral banded shrimp in my tank. Keep those sucker in check.
The normal ones we have (pink/white) are fine and do not get as large as the one ion the video. The one in the video sure looks like a fireworm to me, hole nother ball o wax.