Yellow tang SICK??

Hi my name is Kyle. I've had my 90 gallon reef tank for over a year now and i just got done with the quarantine of my newest fish which was a CBB to control my Aiptasia. I put him in my tank yesterday and today i noticed that my yellow tang (Bubbles) has about a 1inch long darker looking yellow stripe down each side of his body.. it is located in the center and both of them are straight. Just wanted to know if anyone has seen anything like this before and if there is anything i can or should do? Or could it just be stress b/c of the "new guy"?
 
I have a yellow tang that has always had those lines... im pretty sure its normal and woouldnt worry about it...

But then again im a newb
 
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