madframermrc
Well-Known Member
I run my co2 untill week 6 for indicas and week 7-8 for sativas depending on strain finish timesThey're pretty young for 500 ppm, that could be a possible issue. I also notice that it looks like you're running them with HPS bulbs. I don't know much about CO2 but I believe its mainly used in flower in conjunction with very high light intensities.