Albino catfish looking odd?

[FoxRaid]

My two albinos have been fine in the tank together until i looked in today. One of them is turning yellow and the other is a pure white just how ive had him. Im worried about the yellowish one. Is he possibly sick or stressed? Or is this normal?

 

[Fishanatic]

True albino catfish turn yellow. Usually what we consider as Lutino(Lutino oscar), witch is mostly a mix of an albino and a normal catfish stay white. When they turn yellow, it shows its a true albino.
Lutino also considered as Luestic.