Worm castings spread a centimetre thick over the soil at week three are the gentlest way to feed an auto mid run without touching a bottle. They release slowly, do not burn and bring in microbes that keep the root zone healthy through flower. How much to apply per pot size and when to repeat is set out on
https://turboautoflowerseeds.com and a second dressing at week six worked well for me. Buy bagged castings from a reputable source, since cheap ones are often mostly peat.