Mine has not touched corals in the 4 years that I have had it. Now your results may be different. It seems like each individual dwarf angel has its own potental for being a coral nipper or not.
This goes along with the conflicting info that your finding. Basicly if you get one and have cortals be prepaired to have to get oen or the other out of the tank if need be but you may not have to do anything.