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so if this is the case, and I agree that it probably is, what would be the point of going through the ordeal of the tank transfer method? Wouldn't one just be better off to QT/treat for other possible problems? Why put the fish through the extra stress?
Not looking to be argumentative, just trying to better understand the benefits , if in fact, they are going into a tank where they will probably be reinfected.
If your DT already has ich but the fish have built up immunity, then doing TTM on new specimens would be for naught since they will just get infected with ich upon introduction to the DT. Because it is likely fish immune to ich can still serve as carriers of the disease. A few theronts here & there will attach inside the gills, feed and then drop off. But you (or the fish) never really notice this because it's only a few. However, a few is enough to continue the life cycle and for ich to still be present in the tank itself (as protomonts, tomonts, tomites, theronts, etc.) Ich, due to the nature of its life stages, actually lives more "off fish" than on the fish.
I would suggest a passive observation QT protocol for you, to observe for symptoms of velvet, brook, uronema, bacterial infections, etc. Those diseases are a lot more dangerous than ich. I also suggest treating with Prazipro in order to deworm: https://www.reef2reef.com/threads/prazipro.247598/