It's a bit Zen to measure out the right amount for the different nutrients and then add them. When I have time, I really enjoy doing this. But I'm glad that only one of my three plants needs regular fertilisation and other nutrients.
For this "Cake" grow, I found an extra large Lego cake - for scale.
@kannafarmer, I love them! I'm quite sure they make a difference (compared to regular pots). The roots are not long and stretchy, but many little roots that go in all directions. I have some big ones as well and want to use them as "raised beds" on my new balcony.