I had a Chevron in the past. They are one of my favorite tangs. If you have other tangs they need to be the first one in the tank or they will be picked on. They are not as aggressive as other tangs. I lost mine after a year because of constant stress from my other two tangs.
They are stunning as juv. but I also like their adult pattern. I have seen two adults in pet stores. They are black with blue lines.
This picture looks a little more like the adults that I have seen.
http://species.fishindex.com/photo_30356ctenochaetus_hawaiiensis_chevron_tang.html