Dealing with my first ever capillaria infestation. Yuck. Lost one fish, but think the other two will pull through. Tank is planted and has a lot of nooks and crannies, so getting these dead worms out of here is a bear, to say the least. I looked everywhere for the right approach and PraziPro was not it. After that failed, I went to levamisole which is really showing results. Here is what I am doing 2ppm for 24 hours in total blackout followed by a close to 100% water change, then repeat weekly for 2 more doses. After each dose, there is a LOT of cleanup. Will let you know how it turns out. I am also feeding levamisole medicated flakes. Fortunately they are both still eating. In my case 2ppm is 1 gram of Levamisole HCL (drench solution) dissolved in water to treat 120 gallons. A lot of stuff I read was dosing up to 13 ppm! Just go ahead and get a little scale if you don't already have one. They are cheap when you don't need them and priceless when you do. I think this is the one I have: https://smile.amazon.com/LuckyStone-Portable-Electronic-Weighing-Stainless/dp/B00LL0Z1LQ/ref=sr_1_49_sspa?crid=1EQ4B3WWSIIEE&keywords=pocket+scale+.01g&qid=1553451483&s=gateway&sprefix=pocket+scale%2Caps%2C170&sr=8-49-spons&psc=1 This adventure has also taught me that guaranteed snail free isn't a guarantee of a snail free tank. Killed one a month ago and two today. I also learned that levamisole doesn't faze them unless that is why they came out of hiding. Might have been the blackout, though. And I carried 2 garter snakes out of the house this morning. One greeted me getting out of the shower and the other was hanging out around the RO barrel.