11-16-2013, 05:31 AM
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Not unheard of in a plantsd tank with activity growing plants and a light bioload (like a Betta tank) to show triple 0. I would like to see at least some nitrate to call it cycled. In both my planted betta tank, I could most likely go 2 or 3 weeks with not a water change and almost no nitrate. I still do weekly water changes to keep the DOC in check, but more out of habit than necessity. When I first set up my two betta tanks I had a really hard time getting control of both aquariums.
I had a few things working against me:
First these were the only planted Nano I had ever tried and I'm not really a plant person.
Second I'm a Goldfish person were huge bare bottom aquarium and huge water changes are the norm.
I would say that if you can keep the numbers stable for a period of time without spiking ammonia or nitrite then you can call the tank cycled regardless of the nitrate readings.