Are Blue Throat triggers safe with inverts

[Delphinus]

But I thought blue throats were supposed to be fairly strict planktivores? In fact I was advised against trying them because I wanted a pair to try to de-crabify my ritteri reef (which is infested with about a dozen hitchhiking crabs and at 30" deep I can't remove them manually, they see me coming, and rearranging the rock is not really an option since it's supporting a 24" anemone that I don't want to move! And an eel doesn't work because it's an open top tank, so that means an octopus is a certain no-no as well, and a mantis is something that .. well once the crabs were gone how do I get the mantis out if I ever want to have fish? You see my dilemma. So I was hoping there was some kind of hope for the bluejaws to go after crabs, because I quite like them, but pretty much everyone I asked was skeptical that they'd do anything to the crabs because of the strict-planktivore thing).