I have an ongoing theory: expose the fish to ick (yes I know; unheard of, right?). Feed that mofo food loaded with garlic and nutrient soaked food, install a Hugo UV sterilizer, reduce lights to 2-4 hours/day until all ick is cleared. Repeat. Maybe I’m playing with Fire, maybe nature is Darwinism’ing ....but my 180 bowfront tank, is . Knock on wood but this process has been ongoing for over 2 years, and so far .