It is best to give those auto plants 1/2 or 1/4 the nutes and I usually start with 1/8 and work them up to 1/2 of the required amount that is recommended on the bottle, but as Plantguardian told, they usually are ready in two months, so you don't need to fertilize them as much, and if you get some nutrient burn than every day the little plant is stunned you will decrease your end yield, so be careful!