He's usually not too bad, and I've learned to approach the tank slowly. I had food on the top and went to grab it and he went crazy. He was right by the side and he just zigged when he should have zagged. He went pretty hard into the side of the tank. It all happened so fast and then he just sank.
I held him in the water flow for over an hour until I had shriveled hands. I could feel his slime coat wearing off where I was holding him. Thats when I rigged up the tshirt.
When I got up yesterday, I thought he was dead as I found him out of the tshirt and nose down on the bottom. However, he was still breathing so back in the shirt he went. He stayed there all day yesterday and last night. I moved him a couple of times and he twitched a bit. This morning I rearranged him again and felt his body try to twist. Based on those moments and the fact that when he does go nose down, he's straight. I'm hoping that proves his back isn't broken.