Weird colors

[Goldtorch]

I hgot my tang about month and a half ago collor at first was excellent then recently started to fade majorly. He eats pellets

 

[joshky]

Need more information. Tank size, type of tang, water parameters, even fish list might be helpful if it's stress related.

Are you getting any veggies in its diet? (in your aquarium, or supplemented) If not you need to start feeding daily clips of nori, tangs are algae pigs.