 -If it was Costia, am I likely free of it? Or should I do a PP-treatment and kill all good algea, bacteria, and set the whole pond back to start? -Do I need to buy an expensive microscope and learn the business of scraping? (Gilll scraping seems like a hassle...) -Some parasites like Trichodina isn't any problem in small amounts, so as long as water conditions are good, they likely won't cause any issues?