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I'm going to disagree with you - there is nothing wrong with API tests - the issue is usually the test methodology. But - you're absolutely correct - nitrites are not an issue. This exact product that the OP is using says - add Fish and bacteria on day 1. I'm not sure why they are checking for 'a cycle'.Again it’s an api test… lol. Anywho nitrites are harmless in marine animals “unlike fresh water” so they don’t matter and shouldn’t be tested for. If you really had nitrite your nitrates would be through the roof as it would give more false readings.