Clean water, kosher salt, quality food, is all you need for now. Just follow my previous directions, don't waste your money or put your fish or filters through the stress of anti-bacterial meds, when no bacterial infection is showing. There are currently no "fin rot" issues with this fish, it just needs to have it's natural immune system kick in now that it has been removed from it's previous stressful environment. In other words, KISS.
I advised the Hex-Shield & PraziPro as I treat all fish coming in from parts unknown, especially when showing a slightly concave stomach.