Emperor angel

[McThicc]

So I’m not sure what this could be? I fallowed my tank and have my fish in a 40 gallon drilled reservoir. There is copper in this tank but before I even moved him he started turning white. He eats really good everyday even when he was in my dt. Could he be changing color to adult? Or is this a bacterial infection if so how do I treat

 

[theMeat]

Not sure but am sure it’s not color change to adult.

 

[JumboShrimp]

How did this fish end up doing?