I would not trust those disc detectors.
Do an actual test.
If there is ammonia, use seachem's stability, or kordons AmQuel to control the ammonia.
I am confiused though, is the live rock tank also a QT? if it is, it should not have rock in it.
a QT tank should have just a basic sponge filter, or aquaclear for water flow, and no sand or rock.
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