I never said to not get a controller, you need to "crawl before you can walk" And anyone who says not to run Co2 in flower is just plain dumb. You dont have to run it in veg but you do in flower, its plant food just like the lights or Sun is. But yeah get a controller it's the right way to do it. 1300 PPM-1500PPM is fine, I keep mine set at 1500 PPM when you are Co2 shopping get a controller that is light sensitive it will turn on at lights on by itself basically plug and play.