Help, Fish ID needed

[jack95670]

hey guys i was just wondering if any of you could help me identify what this fish is, i bought him about 6-7 months ago as a baby. the store i got it from is usually pretty knowledgeable about the stock they carry, but when i got this guy there was a new worker there and he had no idea what it was. i tried google for all tangs but have not been able to find anything. he changes color on a whim, can go from charcoal black to pale white in a split second. when he is pale in color his tail fin and the dorsal fin turn bright yellow. Any suggestions are appreciated.

 

[nonimmigrant]

hey guys i was just wondering if any of you could help me identify what this fish is, i bought him about 6-7 months ago as a baby. the store i got it from is usually pretty knowledgeable about the stock they carry, but when i got this guy there was a new worker there and he had no idea what it was. i tried google for all tangs but have not been able to find anything. he changes color on a whim, can go from charcoal black to pale white in a split second. when he is pale in color his tail fin and the dorsal fin turn bright yellow. Any suggestions are appreciated.

Dussumier... If memory serves, it's the one acanthurus whose barb is white.

 

[fishnerd]

Acanthurus leucocheilus

 

[AuroraDrvr]

Acanthurus leucocheilus

This one...