["common" names can be tricky. It took me a while to figure out that (to a lot of people) a regal tang=hippo tang=yellow tail blue tang (the "common" name almost everyone used many years ago). I have seen "blue tang" used for a tang with a body shape like a yellow tang (don't know the correct name)
hippo is probably the "best" "common name" for this fish because it is actually part of the latin name for the species. I beleive there are 1 or 2 color variations (from different locations) but I think they are considered the same species.]
