CO2 Generator System Carbon Dioxide Reactor Kit with Auto Valve and Diffuser for Plants Aquarium

I see only a single large bubble coming out of the diffuser. Not seeing the fine bubbles. What am I doing wrong?

Hi ,can I double the amount of citric acid, baking soda and water to get a lil more pressure?

How many bubbles per min for plants in a 4x4 grow tent?

Can I purchase a replacement valve and regulator? If not what size is the threading? Will cga320 fit?”