Melafix has always worked for me, that's all I use now. Meth blue and myaxin have given me grief in the past when I added them to the whole tank, but I remember myaxin being great when used in a separate hospital tank, I used it years ago on what I think were really bad ammonia burns.
I'd choose myaxin out of those, it's used at my LFS to stop open wounds getting infected and it works for that, I have suspicions in harms filter bacteria though, that's why I like melafix.