Powder Blue Tang - Coloration Differences?

[tingleyl]

Why are some PBT's light blue with grey noses and some are darker blue with dark black faces?

What's the difference? Is it the region they were from? Male/Female?

Thanks

 

[Toddrtrex]

In my limited experience with them, it is stress/health related. Light blue = stress/unhealthy.

 

[SDguy]

In my limited experience with them, it is stress/health related. Light blue = stress/unhealthy.

Yup, that's my experience.

 

[pinnatus]

Younger ones seem to be lighter than older ones as well.

 

[tingleyl]

Thanks!