Sarcothelia... Never "cycled" my QT tank. I keep those bio filters ready in my sump and do regular 10 gallon (every three days when running the QT) changes with water from my DT. It has never shown ammonia. We get nitrates but no ammonia. We set up the QT a day or 2 before we get livestock. Run it for 4-6 weeks and then tear it down. Has a heater, a pump filter combo, and some PVC. When we are done with it, we tear it down, throw another filter in the sump and wait till next time.