We can talk here, and maybe it will help someone else too.
The bio-char will render a garden fertile for centuries, very effective add! It must be loaded with good nutrients initially, usually by soaking it in compost tea. Once loaded, it will continue to gather and release beneficial nutriments and house good bacteria.
The fish emulsion can be used to load it too. Any fish leftovers when you clean your fish is a good source. Put it on water to ferment, then soak the bio-char in the emulsion.
Be blessed!
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RE: Using aquaponics farm method to provide nutrients for plants