i have 4 no tills operating right now, and today i'm putting together two more if everything goes according to schedule. seedling soil should be very light and very basic, so standard base soil with only kelp, crab, neem, oyster shell flour and light amount of rock dust and that's about it. no need to overdo it. you can water in some myco when they set some true leaves. no need for anything else, as your mix should be alive and active. same recipe for both veg and flower, but in flower i just topdress some "bloom" nutrients that contain a little boost of potassium and now adding insect frass to that blend as well. yeah it's cheaper to make your own. buy a bag of natural hard wood "chunk" charcoal, smash up to fine fine pieces (wear a mask and wrap the char in an old towel or sheet). then you charge it just like making a compost tea, highly aerated water, alfalfa, kelp, fish hydrolysate (some dilute urine too... but no need to do that). then when you are done charging after about a week or so, make a compost tea in that same solution with EWC or whatever compost you have, some unsulfured molasses, and let that go for 24 hours. micro organisms will colonize the char. strain and VOILA.