I recently rescued a ryukin goldfish that was neglected for quite a while. He lived in a 5 gallon bucket for at least a month or two. I'm betting that he rarely had water changes.... When I got him, he was upside down on the bottom of the bucket... thought he was dead. I thought it was some type of temporary swim bladder issue and I could nurse him back to health... but after a week and a half of TLC, I've observed no change in behavior. He ONLY swims upright briefly to grab food from the bottom of the tank, otherwise, he's always on the bottom of the tank upside down. Pretty miserable, and quite discouraging for me....I'm guessing it was his previous living condition that did this to him. Can someone suggest what I could do to try and help him? Is this permanent and should he be put down? The only thing I've tried so far is salt in the water. I've been looking online to for antibiotics (to treat possible bacterial-causing swim bladder symptoms) but haven't made the decision to purchase yet because I don't know if it IS a bacterial infection that I should be treating for.