Ornate pacman loosing colour on his black spots

[Sajuuk Khar]

Hello there,

I have 6 year old Ornate pacman. His colors have been very vibrant all his life.

Lately I noticed his color is not as bright and some of the black pigment in his dark spots are fading, where I can see the green underneath.

The top of his head near the false eye spots has gotten much darker.

Is this normal or something I should be concerned about?

He seems healthy otherwise.

I have attached a picture.