Patrick since I have only had one fish with a swim bladder issue I don't want to try to tell you what to do because I may give misinformation and I don't want to do that, so I'll let one of the other guys chime in with what they think as treating it, but I don't think just 60 temp will give it swim bladder issues. If you just had low temp but not overfeed then the cause may be from some other problem related to the swim bladder.