My Sailfin has spent 3 weeks in solitary for being the bully. If you have a QT or other tank you can isolate your Yellow. You may find they will get along better after reestablishing the pecking order.
fish, if you rearrange the tank at lights out, the fish will be disorientated and start the pecking order all over again. Not with SW
fish. They seem to a different memory system and can remember other fishes even in different surroundings.
What ever you do I wish you the best with your yellow Tang.