Mela- and Pimafix are not medicine. They are like vitamins. I got Paraguard thanks to advice I got from planted tank forum. It treats viral, bacterial, fungal and parasitic diseases!
With Paraguard and Cupramine (ick treatment), I think I'm all set as far as medication is concerned. Now the cory is swimming up and down and darting to the surface. I'm truly impressed by Paraguard.