I know you've already spent a good deal getting this rolling, but I wouldn't skip the airstone/powerhead. Using multiple medications will lower the oxygen levels in a QT considerably...
I would also +1 to adding copper to the mix (albeit slowly, so the fish has plenty of time to adjust) I see ich on the fish as well, likely what caused the bacterial infection (often secondary to parasites). All other fish that were in the tank with the angel should be treated as well, and the tank left fallow (fishless) for 76 days. Otherwise, the fish will just be re-infested when you put it back in your display...
I would also +1 to adding copper to the mix (albeit slowly, so the fish has plenty of time to adjust) I see ich on the fish as well, likely what caused the bacterial infection (often secondary to parasites). All other fish that were in the tank with the angel should be treated as well, and the tank left fallow (fishless) for 76 days. Otherwise, the fish will just be re-infested when you put it back in your display...
