The biggest risk is in NOT doing a QT on the first aquisiton (IMO
). Stress is the genesis of many dormant diseases is fish. If you can avoid the intorudction of a pathogen into the tank to begin with there is less to worry about later.
Of course I did not do this. I did buy my original livestock from a lfs
that ran copper in all his FO
tanks. I also was able to reserve fish and pick them up a couple of weeks later, so the lfs
pretty much did my qt for me. I did end up with a case of Ich a couple of years ago. I had to tear my tank apart (put all the LR
in tubs so I could catch the fish). LESSON LEARNED.
Now I QT everything except coral before it goes in the main tank. Corals get a slightly different treatment but no original water enters my tank. I keep the biowheel in my sump for when I need it. It's like an instant cycle for the QT tank, but I still do daily 20% pwc
's for the first week just to be sure.