To put it slightly differently: the amount of light (energy) drives the rate of growth. Plants need specific amounts of nutrients (co2 and fertilizers) to sustain that rate of growth.
Your co2 budget should cover a mid-level system. My advise is to go for quality, something that will serve you well for years and something that will retain its resale value.
There are currently several co2 systems for sale in the WTS part of the TPT forum, including mine.
The basic building components are:
- Needle Valve
- CO2 tank
- miscellaneous connectors and hose
The quality and the cost of these components is what drives your final cost.
Buy vs build is mostly a time factor: getting all of the individual components does take time. If you decide to buy, you have a working system in several days.
If you build your own, it might take a month or more but then you will acquire a skill and knowledge that will serve you well in the future.
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