Test Kit
I would borrow someones nitrate test, if you buy one I have always been fond of API but this is me - I am sure there is better but API has always served me well!
Lighting
Can you adjust your spectrum? I am familiar with the brand and model but only through friends. - Not personal experience.
History
I am just confirming that even though today you have 0 nitrate / 0 phosphate - you have not had a sudden rise in the last 3 months. Any live stock die recently?
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