There are at least 2 different species of tang that are commonly called Kole tang in the trade. make sure you know what you are getting. When young both species look similar. When they become adult, they look different (just different. I am not saying one is ugly than another. :))

Thanks - This is interesting - so how do I tell the difference and get one that will have a blue look rather than the brown?

George (gridley) I may be wrong, but I understand the only differences in Kole Tangs is in the body patterns, and I can't even find images of ones different than mine from Hawaii
A true Kole tang ( Ctenochaetus strigosus ) is a copper/brown color
What I see on the web as 'blue-looking' Koles are just lighting differences

Maybe someone can elaborate if I'm incorrect