I have grown cherry tomatoes, Basile, mint, eggplant, broccoli, and various lettuces including the evil one lol. I only have a 2x3 bed and I always use a dual root zone with atleast a gallon of soil.
I take it you are growing this out doors as eggplant would be interesting in doors. How do you find going the [COLOR=var(--post_title_typography-color)]Dual Root Zone? Has it caused any issues for the fish?