Time to learn about "nutrients"
Organic Nutrients: Food, Fish Waste. Another name for Organic Nutrients is Organic Nitrate (NO3) and Organic Phosphate (PO4). Hobby test kits cannot test for these.
Inorganic Nutrients: Inorganic Nitrate (NO3) and Inorganic Phosphate (PO4). These are invisible, but they are what hobby test kits test for.
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