Question about a Tang

I bought what my LFS called a Hawaiian blue tang. He said it was in the juvi state but didn't say what it would change too. Its been in my tank for about 2 weeks. It eats like a pig so i am not worried about that but. Its starting to turn alittle more yellow and has more defined horizontal stripes. So when i tried to look up this tang i couldn't find it so i am not sure its the right classing. Could anyone help with this? oh and at night it when the lights go out it changes colors to a black vertical stripe and a silverish color

 

google regal tang and see if that is what you have... if not then we are going to need a picture to id it

 

its for sure not a regal i have had one before in a past tank. It closely looks to a Atlantic yellow or blue in build. With the neon on outlining the fins.

 

I believe it is a clown tang? does this look right:
clown tang - Google Search

 

could be but right now its bright blue turning yellow slowly i am getting a pic so i can post it cause i think my LFS makes up names so pic coming soon.

 

sorry about the pic the came off the wifes phone with a flash but hes mostly blue with a yellow tail

 

I think it's a Caribbean blue tang

 

i thought it might be but he said it was still in its juvi state. I love the fish its a pig. Eats any food put in the tank and it also grazes on what algae i have left. cool thanks much.

 

Definately an Atlantic Blue, or Carribean Tang, Blue Tang, Etc... You where right in you're guessing. Ive seen many of those for sale in the trade throught the LFS visits.