My yellow still has remnants of those white lines on him after years, but they seem to be more pronounced on your fish. I would bet its just stress from going into a new tank. What are his tankmates and tank size? Do you have any fish that might be giving him any grief?
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.