@triciakickssaas - Growing out of a 5-gallon bin that cost me $10. The nutrients are a couple of cents. Its using tap water. No pumps. No aerators. The grow lights were $8.50 a piece, I have five of them for three bins. Each bin grows 5 plants, so thats 15 plants on this shelf. Seeds are free. Baby bok choy in 3 to 4 weeks. Full grown in about 5 weeks.

And it just keeps growing passively!

I just mix the nutrients and fill it up and replant the seed once every three months. Lights are on a timer.

I don't touch it otherwise. It does everything on its own. I just browse and take leaves off whenever I want stir fry.