First time Fastbuds - Six Shooter

A great week for these SixShooter. I've added some pictures of my new Ecotechnics Co2 Controller. This is set to dose a sealed environment to 1600ppm. I have it set to the correct number on the controller to reach that amount but have my extractor on 35% as I dont want to give them too much. Anyone looking might notice some injured leaves on one of the plants. I spotted it last week and still have no idea what was spilt on them to make them burn like this. That plant seems to have recovered from the assault and both are flying along. As per the phtots I'm planning to scrog these so it's a little hard to get good photos but I will update mid week. Added some more close up photos at day 40. Looks like these girls are on track for a 6 week veg which is exactly what I would have wanted if I'd grown a photoperiod strain. They are just starting to show me their pistils and the new growth is that familiar thin lighter green colour. New week update on Sunday.