I’ve lost two fish to sudden swim bladder (I was medicating for bacterial infection and ich). They had no symptoms and overnight would be curved and swimming spirals. I lost a guppy to it about a week ago. I moved two of my ottos to a different tank while treating and today after I put them back in after they were showing no signs of disease, not even an hour later one of my ottos was spiraling and died 20 min after I noticed it. It’s frustrating. I’m thinking he may have ran into something or idk? I don’t over feed by any means and there’s been no disease for minimum 4 days now.