Hes much more active in the hospital tank than he was in the display. Dunno if that’s a good thing. I’m only running an air stone because I didn’t want him to have to fight the flow. I’m running H2O2 in my display for disease management. I wonder if it burned him and that’s why is all red. I’m hoping now that he’s out of the H2O2 that it will get less angry looking.
If it is still alive this morning, if you haven't done so already, you should lower the specific gravity of the hospital tank to around 1.019 - making it more isotonic with the fish's blood. With that much missing skin, the fish is going to need help balancing its salt levels.
To be honest, this looks like a severe secondary bacterial infection. Antibiotics take a few days to start to work, and this fish doesn't likely have that much time.
Jay



