Chlorurus sp.
I think that this is an Indian Parrotfish (Chlorurus capistratoides) Pink-margined Parrotfish. It seems to best fit this fish. The Indian Parrotfish is found from South Africa to Taiwan. We have most of the same fish as Taiwan. There is a lot of variability and some hybridization with Parrotfish so it can be hard to identify them sometimes. Amami 2025
Same possible Indian parrotfish. I will try to get better pictures next time I see one. Amami 2025