Parazin – Parasiticide. Fish lice (Argulus), anchor worms (Lernea), gill maggots (Ergasilus) & water scorpions (Nepidae) are some of the horrific organisms, which can attack fish and are almost invisible to the naked eye. Parazin destroys these and other insect and crustacean parasites/predators found in aquaria. This is a unique and revolutionary product that usually only requires one dose per infestation. Safe with fish, plants and filters. For use in tropical freshwater and coldwater aquaria. Notes: Leave biological filters running. Switch off u.v. sterilisers, ozonisers and remove zeolite & carbon before use. Replace after 10 days. N.B. Do not use with freshwater crayfish, shrimps, crabs, lobsters, snails or related species. Do not use simultaneously with other medications. Calculate aquarium capacity: For litres – (L x W x D) in cms divide by 1000. Allow for water displaced by rocks etc. Director: Use 1 tablet per 22.5 litres (5 galls.) of aquarium water. Typically the product will take between 10 to 14 days to destroy all stages of the organisms’ life cycle. Do not overdose.