Octopus
Triggers are hit or miss on nasty.
I had a 5+" undulated that was a big baby.(Housed with a 46+" Green Moray)
A friend has a yellow tang that will KILL ANYTHING in the tank with him, doesn't make him scary. A friend has a huma that bites spiny box fish, porcupine puffers, groupers.
I'd engineer a foul tempered octopus.......