this one is easy Micheal, this is a young male Callainos, he will turn solid blue with the very edges of his dorsal,anal, and tail fin turning a hint of yellow. Go through my photo's and you will see a mature male
I'd have to disagree with you there Mr. C. While I'm not exactly sure what it is (I had my shot guessing the ID of this one last week), I'm convinced that it's not a m. callainos or a male.
Great fins.