In the old fertilizing system PO4 was already so low and unnecessary they decided to scrap it and rely on fish food and fauna waste. They recommend keeping PO4 at or lower than 0.05 ppm in the water column.
The new fertilizing system also scraped NH4 and NO3 and replaced it with urea, and recommend monitoring NO3 because excess urea accumulates as NO3.
For few, this is still considered outrageous and firmly intolerable, but in reality most planted aquariums all over the world grow beautiful plants using these levels and compounds.
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Last edited by Edward; 02-26-2019 at 09:22 PM.