Because of illness or not QT right. My first time around with QT I lost an O'clown. That is when I realized that ammonia can rise pretty fast. Have not lost a fish since.
I QT everything now, but at first I had LOTS of trouble getting fish to survive the QT, due to enormous ammonia spikes. I now always add live rock when I QT. If I don't need to treat, then the live rock is fine. I have never needed to treat, but if I do, then I'll deal with the ammonia issue I guess, if I kill off the live rock.
I have lost two of fish in QT, a Carpenters Wrasse and a Purple Firefish. IMO it was better there than in my display when it might have taken more fish with it.
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