I have a platy that I purchased about 3 weeks ago and when I did I could tell he had internal worms due to his long stringy white threadlike poop. I did 2 rounds of Prazipro as I've been told its the best dewormer and I plopped him in the main tank after treatment since he was fine besides that. Yesterday I was feeding and noticed that his poop looked the same as it did only shorter. He's still very active and eats. I am doing another round of prazipro and then after 7 days I will repeat the dose to kill the babies. What is confusing me is I did 2 courses of prazi in the quarantine tank and he's still showing this poop. I've read that praziquantel doesn't take care of all internal parasites so maybe that's it? Is there a dewormer that contains praziquantel, metronidazole, and levamisole in one? Surely that would knock out the internal parasites.