Interpet liquisil general tonic no5 100ml reduces background levels of bacteria fungus and parasites in aquariumsr in every aquarium there are potential disease causing organisms including species of parasites fungus and bacteriar liquisil general tonic keeps these disease organisms at an acceptable level and thus prevents disease outbreaksr interpet no5 liquisil general tonic for use in coldwater marine and tropical freshwater systemsr when to use interpet liquisil general tonicr reg