My 300 litre Low tech,NonCO2 is all crypt's and Anubia.(Crypt Parva,Balansae,Bronze, and Red)
Tank is planted in Miracle Grow,Peat,covered with Black Diamond Blasting media.
Believe plant's will uptake nutrient's from where they find them,but I dose maybe 1/3 EI each week with 50% water change...