Im not 100% sure on brand names(in australia) but if the fish isnt infested with hexamita then these meds are just a waste of time.
and will melafix help heal his wounds?
Most certainly but ensure the water is well areated and you follow directions carefully.
I would consider the treatment in that article I posted earlier and see how it goes,,unfortunatly the scaring from HITH/LLE can take a long time to heal and in some cases the scars dont heal at all depending on how long and how sevre it is