You welcome! But I'm not sure about the species. I'm not at home, so I have no access to my library,but in the web are many excellent pictures of that group. I like all kinds of triggers, unfortuantley, there is only a"standard species"sortiment in german public aquariums.And many triggers species are not offerd by fish dealers.
I would opt for Melichthys too, but not vidua, maybe M.niger (although they are generally much darker). However, I don't have any info on Carribean species so it might be one of those.