1. Acriflavin
2. Betadine
3. Copper Sulfate
4. Furanace, Furoxone, Nitrofurazone
5. Malachite Green
6. Oxolinic Acid
7. Potassium Permanganate
8. Tea Tree Oil

Reference: Herwig, Nelson. 1979. Handbook of Drugs and Chemicals used in the Treatment of Fish Diseases: A Manual of Fish Pharmacology and Materia Medica. Springfield, Illinois: Charles Thomas

Also, oregno oil can be used, but would need to be emulsified with alcohol. "Almond" leaves and the berries of the black alder tree also have becteriostatic effect, as does peat moss.