Yeah Ive heard of autopots. Ive looked into a system before and it just seems like a lot of set up and trial and error to get running right. I might do it after I get another tent, that way if I end up killing a grow I still have another going.
Soil isnt anything special, its just fox farm happy frog, though normally I mix in a little bit of their ocean forest too. This time I took a different approach and layered, ocean forest on the bottom third, and happy frog on the top, so as they mature the roots grow into a more nutrient dense medium.