Boiling salty water the best.
You can use diluted myxazin for equipment.
If you use an antibiotic it will wipe the benefical bacteria out in the filter.
Antibiotics.
Tetracycline a good gram pos, gram neg antibiotic.
You need to get a gram positive and gram negative antibiotic.
Will find the info for you.
http
/www.fishjunkies.com/Infections/bacterial.php
Do you have any antibiotics from a doctor in the cuboard which are not out of date.
Kanacyn
Manufacturer: Aquatronics
A gram positive and gram negative bacteria treatment for red streaks or hemorrhaging, dropsy, fin and tail rot, inflamed gills, protruding or loss of scales, fungal infections, vibrio, tuberculosis, wasting away and body ulcers.
Erythromycin
Bacterial medication that treats gram positive & some gram negative bacteria, including those that cause fin and tail rot, Gill Disease and Molly Disease.
Spectrogram
Ultra-wide spectrum antibiotic for treating: red body patches, hemorrhage, white body slime, protruding scales, bacterial infections, Furunculosis, Columnaris and fungal infections. For use in fresh and marine aquariums. Do not use with invertebrates. Great for quarantine tanks and baths.
Active Ingredients: nitrofurazone, kanamycin.
Tetracycline
Manufacturer: Aquatronics
A broad-spectrum antibiotic used in the treatment of gram-positive and some gram-negative bacterial infections. For infections of fin and tail rot, frayed fins, popeye, inflamed gills, mouth and body open sores/ulcers, livebearer disease, dropsy, Columnaris, and secondary infections such as fungal. Specific for livebearers and goldfish. Aerate the aquarium well when using. Useful for the control of some common bacterial diseases, including Aeromonias and Pseudomonas Genera and the Mysobacterial group.