I agree with most on here aboutt he QT. The stress of being in QT is worse in many cases than the stress of a new tank. why do it twice? A BIG reason to do it is in an agressive system with fresh caught fish. They are not healthy enough to be in the DT yet because of the travel time, and will not last.
Easy solution, buy healthy fish :P
I also believe that ich is in every tank, If you put together an entire ecosystem of single celled creatures up to full size fish and managed to filter out one single celled creature in the mean time, you deserve a Nobel Prize.
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