Dropys is caused by a number of things such as polystic kidney disease organ failure internal bacterial infections the most effective treatment I have found is aquarium salt 1 table spoon for 2 gallons the salt will help reduce the fluid buildup and metroplex in food feeding a small amount twice a day for upto 3 weeks as that treats aeromonas that can cause some of the symptoms you see with Dropys and dose the tank with kanaplex that will treat any possible bacterial infection and it's a good antibiotic treatment kidney infection