Ok thenIt’s a bit complicated. The flukes are not prazi resistant - what happens is that with repeated doses, a bacteria grows that eats prazi. Eventually, it eats the prazi before it has a chance to work. You won’t see this with just two doses - it takes 5 or more over time.
That could potentially be an issue, since I QT my fish but not corals, so if I introduced flukes again and treated in the DT a couple of times throughout the tanks life, could that become an issue?
This is obviously just an example and I'm of course not guranteed to introduce it again, but maybe it can