Phosphate 0? You probably just answered your own question. Plant will have a hard time or will not grow without phosphates.
Plants need Light, C02 and nutrients.The nutrients needed are N,P,K,Ca,Mg,Fe and Trace (Cu,Mn,B,Mo,Zn, etc)
In order for plants to grow they need a good amount of the macros:
P from Phosphate (P04) is one of the macros that is always almost 0 if not dosed on a regular basis. N can come from the fish waste, plant matter, etc. As it comes from NO3 which is nitrate.
Ca,Mg and even K can come from the tap but can easily be dosed using what they call a GH Booster.
Fe or Iron can sometimes come from the trace.
So how much do you need?
1-3 ppm Phosphate
5-20 ppm Nitrate
The amount varies depending on the light and C02 factor. High light and high C02 Dosing means you need to have all of the nutrients in non-limiting amounts. Meaning an abundant amount to make sure that plants have all what they need to grow.
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