Philippine Blue Smokey Pearlscale Angelfish
(and Blue Ram)
That's not color noise on his crown; he (she?) is really just kind of glittery like that.
The full size image is just awesome, even at 100%; there's nothing that this smaller size hides.
Sony DSC-RX1 1/30s f/8.0 at 35.0mm iso250
full exif