When I got my first set, I tested one container with the cap on just with the top small cap removed ( not twisted closed, just set on) and with the other container with nothing at all. To my surprise, after a month both grew almost identical. So now I have all of them with the caps on with the top small cap removed, because not only works as good, also protects from many contaminants that could invade the culture! And of course you see that nice thick brown layer that has grown, that when you move the container at the shining period, you can see the blue flash even with some lights on! ^_^
Product was unique and interesting. My complaint is that the kit did not come with any instructions.
Sorry about that. Every kit should come with a printed instruction manual. We also have online resources: https://pyrofarms.com/pages/pyrodino-and-bio-orb-instructions-and-information