Treats gill and body flukes which cause fish to flick and scrape. Other symptons include 'clubbed' gills , cloudy patches on fins/body, 'yawning' and lethargy. Also treats internal worms.For use in seawater, tropical freshwater and coldwater aquaria.Do not use in aquariums containing crustaceans, echinoderms, rays, seawater sharks, piranha, sturgeon, sterlets or related species. 100ml / 5 day course for 200 litres