hello may i chip into this topic and suggest based on many fails with autos that , you need to have them exposed to light 18 hours or so as true autos will flower based on age so need to make sure you veg as much as possible
and get them to a good size before they flower , in addition have light in good distance in order for them to grow, when their young i suggest adding good soil ( pete ) and add kelp and humic to them and in week 2 add some
azoz around the base it will help them absorb nutrient in soil, week 3 give them half a tea spoon of 20,20,20 balanced nutrients ( i suggest grow more 20,20,20 yellow label or 16,16,16 ) which has all essential elements for any plant, when they grow larger you can increase nutrient to one spoon give the plant some space so you can add nutrient 1 watering and cut on the next then repeat,for watering a good way is go with for each gallon of soil add 1 pint of water so for 3 gallons i use 2 - 3 pints of water and let dry but not bone dry you need to give the plant space to breath and expand by 2 cents