Flame Angel has many dark spots - is he sick?

[Gooli]

I bought a nice flame angel recently and he was vivid red all over.
After a week in my tank i noticed that he had darker coloration on his head and around it.

He is behaving normally and eating but i do miss that vivid red...water parameters are fine - what happened to him? is he sick?

[kraze3]

Do you have any anemones in the tank, could he have gotten stung
check this link for some pics
http://www.saltwaterfish.com/vb/showthread.php?t=127010

[kevin2000]

Color variations are common in many fish .. often the result of stress sometimes just natural. If this is a new fish then stress may be a contributor and the problem may go away on its own.