IMO, this fish is dangerously thin along with the color loss. I'd do everything possible to fatten him up. Did you see him eat at the store? Is this the same fish that was covered in white spots? If so, they will probably return. If he gets his health; a varied diet with plenty of greens , vitamins, and a healthy tank will bring out his color. I hope I'm wrong; but, IMO, there is a lot more than just "stress" (the most over-used word in our hobby, IMO) bothering this fish. Edit: i didn't see page two, I thought the white spots were parasites, BTLDreef's pic clears that up.