My wife & I got the 92 corner DT from our lfs that was closing. It had a black & white clown. We added a powder brown, kole, engineer goby, and flame hawkfish (not all at the same time). Suddenly, the kole was scratching and we did not have a QT. By the time we got a QT and set it up using water from our 65, the clown was gone. We began hypoing the QT, only the flame hawk survived.
We now have 3 QTs - 1 for fish, 1 for corals/inverts (and fraggin), and a 5g for emergencies.
Thanks to all of you that helped my wife when all of this started. Your knowledge and willingness to help is the only reason we were able to keep the flame hawk alive.