that bite is too clean to have been anything with claws or pincers it almost looks human bite like or a moray but that's ridicules but I think I found the murder suspect drum roll please
its...
...........
.....................
the bobbit worm
they are true fish eaters and I have watched a video on youtube when a display tanks at a FS had one ate all the fish and dragged coral to its cave each night and even killed some
goodluck I would recommend searching every inch of your tank in my case If I were you I would take it down and start all over agin it would be worth it goodluck
