Include the following items.
CO2 bottle – CO2 bottles come in various different sizes.
Regulator – Carbon Dioxide is introduced firstly through the use of a CO2 regulator.
Solenoid – They save you money and stop the wastage of CO2. During the “lights-off” hours your plants no longer need CO2.
Bubble Counter – A bubble counter allows you to monitor the rate of CO2 entering your aquarium.
Diffuser – a diffuser allows an effective method for CO2 to enter the aquarium the CO2 is pushed through a porous medium that breaks down the gas into a fine mist of bubbles.
Tubing – Tubing is needed to connect your regulator to your diffuser.