Also all fish do not carry ich.
Some fish like gobies and wrasses are resistant to ich and it is exceptionally rare for them to get it. Only roughly 10-20% of wild caught fish actually have ich, but due to everything kept in same holding tanks and then in same systems at pets stores, the problem escalates.
I haven't had any trouble with my 20g QT-had a juvenile emperor and an atlantic blue tang in there for 1-2 months-not at the same time-lol
Could be they were only 2 inches at that point.
In my personal opinion, better safe than sorry, just costs me an extra bit of time and space.
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