Meercat_Maric
New member
Water change is often not the issue.
Your biological filter medium in QT MUST have experienced enough ammonia and processed it, and have done so recently before QT starts.
Not just robbing from DT only. IT is ok to rob some seed from DT, but robust cycling of the QT medium using pulses of ammonia is necessary in general.
But since in your case it is only two small fish, you might have been lucky that a less robust cycling might serve you well.
I don't like chances and I always urge you to cycle the medium for QT robustly and deliberately in advance using pulses of ammonia.
True true, I will buffer my media by robbing some from my 120's sump.