okay i only have 2 questions. I have the solenoid thing for the co2 tank and it came with two guaskets. one was a small rubbery one, and the other one is a bigger one that is plastic. do they both go in the connector?

also, y does it have a plug? is that controlled my a pH controller? so if i dont have one, i dont need it connected?

one last thing, does the co2 enter through the bottom of the bubble counter then upwards?