Flagyl/Metronidazole
I keep some pigeons and I have to treat them with this for bacteria related infections.
Metronidazole works by entering bacterial and protozoal cells and interfering with their genetic material (DNA). It damages the DNA and also prevents the bacteria and protozoa from forming new DNA. This ultimately results in metronidazole killing the micro-organisms, which clears up the infection.
I hear its also used after surgery to prevent infection from appearing. Personally I use Flagyl tablets in my birds drinking water. I'm a noob with fish so wouldn't know dosages etc...
It's hard to get in the UK, I have to get mine ordered from Spain.
If you need contact details for purchase from Spain just let me know.
Mac (the noob)