The formalin didn't seem to work on it. Any recommendations? Please don't say kill the fish I like it too much.
Are you doing your weekly water changes in the hospital tank? With these smaller tanks it is very important to keep the water quality as high as possible - especially with a sick fish. Once the water quality starts going down hill, the fish will follow suit. Does the hospital tank have decent water circulation? I was thinking (in the other thread about this fish) that you had mentioned something about having cyano in this tank as well? Is the salinity still at 1.020?
I'd be really worried about that diet of brine too. Even soaking it in garlic, it won't have the needed nutrition that your clown will need to build up it's immune system. Maybe you could try soaking the food in Selcon as well, but eventually that fish is going to have to learn to eat healthier foods.

Wendy