TB gets over 2000ppms CO2 at peak biological respiration, and she isnt the only one, someone else was asking me why this happens (homesteader), since they get it too. So long as the fans are running to mange this amount, why would you need to add any more?
FACE applications like Breathe are better for the environment, but without the biology, you would struggle to get the levels right for 1K bulbs mate.
Since you run with active biology via the media and the microbes added, alongside the manure you should get good levels without tanking extra in.
If you have a meter, keep an eye on it mate then make a decisions from there. Indoor CO2 is highly over rated IMO. Now we have CO2 being made by microbes, and converted alongside the required added minerals in a Nano breathe application we really dont need to tank in more imo, even with high lights.