Active ingredient: Blended kanamycin-based medication (broad-spectrum antibiotic)
How to use (from the label): Dose: 1 measure (included scoop) per 20 L. Repeat: every 48 h, maximum 3 doses (a second round only if fish show no stress). Prep: Remove invertebrates; turn off UV/ozone; remove carbon and Purigen. Food: Or as medicated food: 1 scoop KanaPlex + 1 scoop Focus + 1 tbsp food, daily up to 1 week. After: Remove with activated carbon
Careful: Seachem says it does not harm the filter bed. Remove carbon/chemical media and invertebrates. Antibiotic: prescription-only in the UK.
Rules: UK: antibiotics (including for ornamental fish and corals) can only be obtained on a vet's prescription; buying without one is a criminal offence. Labelled for ornamental fish only.
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: Seachem KanaPlex. Not endorsements. Always follow the label.
5 facts checked with sources