DreamPond Praziquantel powder Fluke Prazi Flukes Parasites Koi Pond 50g 100g 150g 200g DreamPondTM (praziquantel) is the safest most effective koi medication on the market for treating fluke parasites 50g Treats 5000 Gal, 100g Treats 10000 Gal, 150g Treats 15000 Gal, 200g Treats 20000 Gal Praziquantel is an excellent pond treatment for internal tape worms in goldfish, koi and pond fish. Unlike most products Praziquantel does not set back your biological filtration system and you do not need to do big water changes.