Another thought on this:
Amphilophus most often fade only the black pigment so the reds, yellows, and blues (as in red texas) still show through.
With the creamsicle pattern, the red also fades, leaving a fish with red and white that tends towards more white as they age. Fading viejas also tend to lose all the color and head towards pure white. I think there are two possibly different mechanisms for this, as the marbled fenestratus, for example, show white spots with no color even as young fish.
Your fish definitely has both amph and vieja blood, and I expect it was probably dark colored with pearls all over as a juvenile.
That's a gorgeous community tank, by the way!
