One ugly SOB... LOVE IT! haha, I really wish scorpions/frog-fish/leaf-fish/anglers where reef safe, as I love their character and rough appearances... That said I am thinking about getting a mini angler if I see one come up for sale, one of the ones that only gets to like 3-4" so he at best will only pick off a small chromis once and a wile.
I have seen a lot of these in reefs...other than the shrimps etc they are pretty much reef safe...snails and hermits would be okay most of the time, snails would be completely safe. Small fish, and things without hard shells are gonners though.
That is one awesome fish...incredibly jealous.