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Yes - but aren't you the one who always tells those who practice management - that ich can still be present - undetected in the gills? Why shouldn't that be true after quarantine as well?
You see there are thousands of isolates of ich - velvet and many other cillates which have not been described. To pretend that any quarantine protocol is effective for all is delusional. Those who practice ich management through dilution assumme that ich or some other pathogen is present in their system everyday. This approach is works regardless of the variance in isolate life-cycle. It doesn't matter if its 72 days or 72 years. Dilution holds the pathogen below lethal concentrations continuously - and eventually the combination of filtration and the fishes own immune response yeilds a pathogen free environment.
What's delusional is thinking you have a "magic filter" on your tank that takes care of any & all fish disease problems. Is this were true, why aren't you or some company making millions on this idea since it is the holy grail all reef keepers seek? You can't tell me with today's technology that someone with enough engineering skills can't design & make a SW safe DE filter that's not a PITA to clean/use. If it works as well as you describe, it would quickly become an essential piece of equipment for any SW tank.
There are pros & cons to what we both advocate. No "silver bullet" exists, but I can appreciate what a DE filter offers in the way of ich management. Why can't you do the same for QT? Again, no 100% perfect solution exists to any problem in this world.
Before I finally decided QT was the way to go, I employed ich management for almost 30 years. And during that time I could go years without ever actually seeing ich on any of my fish. But my fish's behavior told me it was still there - scratching on the rocks, some head twitching, etc. At the time I told myself it was something else - maybe the fish just had an itch that needed to be scratched? But eventually the tank got hit with a "stressor event" (I lived in a hurricane prone area so we would experience prolonged power failures), and that was all the evidence I needed that ich was still very much in my tank. Fortunately nowadays power generators are a lot more widely available and affordable.