u/Far-Friend8408

I have a 60 gallon tank. I know its not ideal for his size, working on a new 100 gallon right now getting it cycled. Out of nowhere I wake up to him on his back. Water levels are perfect and no ammonia levels. I adopted him injured, you can see his tail crooked. But he's been like this for years. He's still moving a bit. I put more air stones in the tank but im kinda clueless on what's going on. Could he just be at the end of his normal life cycle?