What kind of filter media are you running with? That is the only thing I can think of that would be removing all the Nitrogenous compounds from your water.
SirWired
SirWired
Ms.Bubbles said:How about buying a bottle of ammonia and using it to test your ammonia test kit? You can usually get a bottle in a supermarket or hardware store...
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Ms.Bubbles said:OK this situation is bending my mind into a pretzel...what magical elixir is in your tank water that is allowing you to keep a guppy in a 5 gallon for 2 weeks without a trace of ammonia? You ARE feeding you fish right? (just kidding)
I've heard of a cycle stalling due to low KH/PH crash, but your PH seems stable. Also, the stall usually happens in the nitrite phase of the cycle when ammonia won't go down.
Anyone out there have any ideas??????