I try and stay with more natural method when treating and the number one treatment is prevention with clean water from regular water changes.
My medicine cabinet:
water-fresh, clean, dechlorinated, like temp
Aquarium salt 1tsp/gal-3tsp/g for no longer than 10 day- for injuries/wounds
Epsom salt 1tsp/g-3tsp/gal for no longer than 10 day-for swelling/bloat/constipation
*note with either of the salt treatments I make 100% daily water changes
Oak leaves or Indian almond leaf-for tannins, antibacterial/fungal properties, calming effects
Fresh crushed garlic-use of either the juice or the garlic itself-appetite stimulation, purging
*note-garlic should not be left in the tank-remove any uneaten ASAP to avoid fouling the water
Rainwater-slowly to avoid extremes that can cause shock-for softer water in some stubborn cases
*note-testing and comparing regular source water and rainwater for pH, KH, GH, nitrate before use to avoid extremes that can kill the fish. Also, safety due to pollution, pesticides, chemicals from water itself, collection bucket, collection method
Live food-high protein, fiber, stimulation of hunting instinct, promote healing, constipation...etc..
These are a few thing that I use......