Hey buddy sorry to hear about your fish. A little optimism for ya, a buddy of mine had a clown sinker just like yours. after quarantine he decided to add him to his display once he ruled out parasites/sickness. (Was a spine issue) The little guy hosted his air stone in the corner and was able to stay a float on the air bubble stream and lived a whole year. Still his favorite fish of all time. Prays for your fish!
Hey bud, thanks very much for that, it's appreciated! I won't give up on him!