For Co2 injection that is on 24 hours a day, you'll just need to monitor the Co2 levels using the drop checker... tune the bps rate until you see the indicator solution maintain a consistent range of dark to light green color during both day and night. Note that the indicator solution has a delayed reaction time (usually around 1-2 hours delay, depending on the diffusion rate).
Start with low bps (ie. 0.5 bps) then check the indicator color regularly and gradually tune it higher over the span of a few days if required. The amount of Co2 that your plants can effectively use will depend on your diffuser placement and circulation pattern, so just shift them around to find the ideal combination.
You can also start with high bps (ie. 4-5 bps) then gradually tune it lower, though that method tends to waste alot of Co2.

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