Just give him time and he might go after your sev more.
I have a pair of rose queen and a few happy breed king kong and they do the same thing. They were all kinda fainted then they got red and with a hump then the hump faded and the color got pale except for one.
When the lights are off, color comes back and gets pale when lights are on. I noticed that after a water change, the get red again. I have not tested my water, but I think that ph got more neutral and nitrate, nitrite gone down with water change.
My guess is that your fish will lose some of his red because overseas have been feeding him color enhanced food. Beautiful fish, nonetheless. You got 2 of them, got picture of the other one?