yellow tang stress

what you are describing sounds like just night time coloration.

they tone their colors down to blend from night predators.
 
That white line is also typical night time coloration ;) Other than needing the feeding upped a bit, he looks good. Try and feed the seaweed such that there is a piece in there all day to pick on. Trade in the blood worms for some marine based foods. Formula Two from Ocean Nutrition is excellent for tangs, nice mix of veggies and meaty foods.
 
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