Welcome to AA!
Seems to me that 5 days is very short for your tang to have faded due to poor nutrition (unless his diet at the LFS
was equally poor). I know that my tangs tend to have less color at lights on first thing in the day than at the end of the day. Is there anything on the fish (dusty looking, spots, coating) causing this lightened appearance?
I feed my tangs nori, formula 1, formula 2 and Prime Reef. Add a little garlic and selcon to these and you have a good mixed diet. I'd add some angel mix into the rotation if I had an angel in the tank as well.
Good luck! Hopefully he'll rebound as the stress in transit dissipates.
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