Dont feed till day 21 or 3 sets, use
ffof for medium, clay for drainage, a few times a day use finger and move seedling back and forth this will help mainstem harden faster, do not transplant, 99.9% of my autos go in 3 gal pots, i use botanacare pro grow in veg 1ml per gal watered down, dont top, i use
Atami Bloombastic 1ml per gal watered down go easy. Most autos can be pruned, run your cycle 18/6, pic is seed i found on floor around 60 days old. Keep things simple.