I know some autos can go their entire lifespan at 24/0 or 20/4 but switching back and forth probably isn't good. They are a weaker hybrid to begin with so I would treat them like a normal MJ plant. What breeder/strain autos are you doing? I have 2 Buddah Seeds White Dwarf (white widow) fems. Search the FAQS and logs for more help. :hippy: