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Am I right in assuming there is no need to test for nitrates until I start to see some nitrites?That seems logical if my understanding of the cycle is correct.
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To directly answer your question, you are correct, you do not have to test for Nitrates until after you start seeing Nitrite levels.
The frequency with which you measure your Nitrate levels is up to you and probably everyone in here has a different answer as to how often they do it. Nitrate levels are a larger concern in the Saltwater community than they are in the Freshwater. My earlier answer only reflected my personal preference in the matter. I only say that because I am kinda retentive about it and I want to know EVERY number, EVERY time. I test pH every time as well, while others don't bother after they know what the expected pH from their water source usually is.
Still others don't test for Nitrates at all once they've gotten some to show, and are content to know that their ammonia and nitrite remain at zero. It is a comfort and preference thing.