Other option is move to a quarantine tank with minimal water so it has to sit on its belly and cannot spin around or move around much. Add vitachem/salt/methylene blue to that quarantine tank. Continue to monitor.I just frustrated. Never had this situation before. The puffer just lays on its side breathing normal. Then occasionally takes off but looks extremely drugged crashing into stuff and even twirling around. It look perfectly normal (not skinny) with great colors. If I grab it, it feels like a very healthy muscular fish and it definitely will break free.
Just sad tonight. I have a bad feeling it was my fault. I focus so hard on water quality and I am thinking m blind spot was nutritional. Grrr