I think the Atlantic version isnt as pretty as the pacific versions and is even less hardy. Both of these require alot of swimming room and should only be kept by experianced aquarists. Usually you can get the Atlantic version from rare fish places, not because they are rare but because there is no demand for them. The place I inquired about them said they rarely had any requests for them because of their inherent unhardyness and unattractiveness. The Pacific Blue, also called the Palette Surgeonfish requires at least 100g and excellent water quality and even then sometimes they get sick just from travel.