This video gives you the basic rundown of a CO2 injected system.
What you need is a co2 cylinder, regulator, solenoid and diffuser and co2 tubing. Put them on a 8-10 timer with your light and you are set for awesome growth.
Always run a powerhead to disperse co2 bubbles into your aquarium. Pressurised CO2 is recommended. I do not advocate the use of CO2 tablets or excel as they do not work very well.
Product links
C02 DIFFUSER - https://amzn.to/2DzwtqK (SS metal ones last longest - just replace the ceramic discs as required)
REGULATOR - https://amzn.to/2BzPHw9 (I only ever use the best - TUNZE is german made and super reliable)
ALL IN ONE - https://amzn.to/2RWYcXD (Chinese made and cheap but somewhat reliable. I still recommend Tunze over this but budget friendly option)
CO2 TUBING - https://amzn.to/2SAfvTB - Always buy proper co2 tubing as it doesnt leak carbon dioxide
