I would be nervous treating my tank with Prazi, not that it will stay active in the water and Carbon would remove it, I just do not think I would use this treatment in a stocked tank with plenty of other worm critters that could die off causing an issue. Though I do know that your tank is relatively fresh and without said worm critters to die off causing issue. did you consider using Salifert Flat worm exit Or was the Prazi the more effective or safe treatment for your tank ?? I also wonder if some type of fish feeds on them well enough to wipe them out or keep numbers down. I have a book that covers Acoles among some other similar species pretty well that I am trying to locate in my attic, this is an older paperback book given to me by an old salt from florida years back. Of course some of the information is outdated but there is some interesting info none the less.