I suspect that there is a worm-like parasite residing inside the mouth of my banggai cardinal fish. The fish is quite small and has refrained from eating for several days, even rejecting frozen foods. After a brief description to the AI model, it suggested that the parasite could possibly be a parasitic copepod, which may be manually removed. I am curious if anyone has encountered a similar situation and can provide insight into what this parasite might be and how to effectively address it. Unfortunately, I do not currently possess a cleaner shrimp, as I am awaiting their availability in local stores.