Aqua Prazi 50gAqua Prazi 50 grams treats 5000 gallons Koi Pond Treatment for Fluke Parasites Aqua Prazi: Pure Praziquantel with No Fillers or Added Medications! Effectively combat the number one enemy of koi pond fishflukeswith Aqua Prazi, a safe and potent solution. Fluke parasites are notorious for causing severe koi ulcers, body sores, and bacterial infections, but now you can tackle them effectively without compromising your fish's health or your pond's