So I decided to separate my female betta that was getting picked on, as I have nothing else im afraid I used a large vase. I set it up with conditioner, heated and added Tetra General Tonic, she was literally in there for about 10 seconds before she died.
Im absolutely devastated, if I had left her in her tank she would still be alive. Her tail fin and scales were just so damaged I wanted to repair them. I used AS with my other betta and still to this day think it made his fins worse so I didnt want to use it with the female betta. I did however use the tonic on Aden when he had fin rot and he also died minutes later but he was on his way out anyway so I just put it down to that.