I have only once seen a male blue throat trigger have the beautiful purple color shown in "the book" and each time i see them in stores and in peoples pictures here they look darker and more grayish blueish than the purple that the book shows. Again I did see one in a store that looked more like the book but he was gone in a day. Does it vary based on collection location? or is it just a function of coloration changing as they age a bit? Again I am talking about male BTT with the yellow fins. Thanks for any feedback.