Yes you can if they are all autoflower plants. I'd go 20/4 if you can. As muddy said though, if you have some photos in there with them then you will HAVE to switch to 12/12 to get those to start flowering. However, you will have a reduced yield from the autoflowers under that cycle. Good luck with your grow!So if I got this right I can leave the 18/6 schedule and never go 12/12?