Active ingredient: API Melafix: Cajeput oil (Melaleuca cajuputi), about 1%
How to use (from the label): 5 mL per 10 US gal (38 L); diseased fish daily for 7 days then 25% water change, continue if needed; new fish daily 3 days; remove carbon if possible
Never mix medicines unless the label says it is safe, and remove shrimp and snails unless the label says they are safe.
Examples you may see in shops: API Melafix. Not endorsements. Always follow the label.
5 facts checked with sources