If it is septicemia, maracyn 2 is the way to go. you should of seen my goldie before the treatment. Its good stuff. Honestly its sound like there is some kind of infection going on anyways, won't hurt to try. I gave my fish M2 and 25% of the daily recommended melafix dose just to help will the open sores. Had no problem using them both at once. results were almost immediate. Also used stress coat water conditioner every pwc. that might of helped some with stress I'm sure but def didn't have any negative affects
If you do decide to use M2 make sure you keep bright lights away from the tank.
If you do decide to use M2 make sure you keep bright lights away from the tank.