What fish is in the background?
Fish often stop eating if they are moved tanks for a few days depending on their confidence.
Have you added new fish recently that could have brought something, how old is he? Give him some boiled shelled peas and add aquarium salt at two teaspoon per gallon before using meds IMO.
No new fish added, he is on the hospital tank with Epson salt, hes been there since Thursday, I did a water change yesterday.
Thanks.


