No idea about the CO2. I do know the persimilus or persimilis not sure if I spelled it right is a beneficial insect. It destroys spider mites. Another thing you can do is find Lavender flower high in Camphor or Rosemary I believe is another plant high in camphor. What you do is drop the flower in a 1 litter bottle and let it soak for 48hrs then strain and spray your leaves and when I say spray they need to look like they are dying so soak that all the leafs are droopy hats how you know you have soaked them really well. The camphor destroys the spider mites eggs by making them pop. How? Well the eggs have a breathing hole and the camphor does a good job at blocking that hole thus making the egg pop. And it kills the spider mites. I’m the states there is a website liberty oils I believe I have to look but anyways they sell essential oils and just look for Lavender, once you’ve done that check on the ingredients pick one with high camphor and your good to go. I’m actually growing my lavender my own rosemary also have stinging nettle, Aloe, and Comfrey the bocking 14. All great uses for cannabis. Hope that helps.