Establishing the new lower salinity, the return to normal salinity, and maintaining hyposalinity can be tricky and time-consuming, though.
SG has to be low enough, yet high enough. Assuming your
QT is smaller than your main tank, top off may be an issue depending on evap rate. I seems to me that if you are going to remove your fish to
QT anyway, a copper treatment combined with slightly lowered salinity (thought to ease the stress level in fish) in the
QT may be a lot easier.
Of course, I hope never to have to find out for myself!!
BTW: It is an absolute pleasure to read and participate in this and the other forums. I agree with all of my other brother newbies that the advice here is first-rate. Even when opinions differ, it provides a series of options so that I can make my ultimate decision based on a knowledge of the facts. Thanks to all you vets who take the time out to help. ALthough I've done a TON of research and am probably "book smart" when it comes to
FOWLR, there is nothing like experience to provide the ultimate knowledge. The problem with learning by experience, though, is it often gives us the test BEFORE we've learned the lesson.