Quick CO2 questions

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Ok so I picked up a complete CO2 system off CL for $20😎
In my research it would seem CO2 is best used starting mid flower. I’ve also heard that you should match the amount of CO2 to the amount of light you are using. Please verify the truth to this

The sensor reads in the 500 - 750 range. My light maxes out in the low 900’s ( tsl 2000 ) , so the next question is it worth it to fill the take and add extra co2 ?
 

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