Caliban07
Aquarium Advice Addict
Im just getting started with Co2 in a plant only/qt tank
This helped a lot
That's good then. You can afford to turn the co2 up a lot more with only plants [emoji106]
Just remember that of the co2 that is injected in to the water column a lot is actually lost to atmosphere then what remains must make it to the plants.
There is no definitive measure for co2 in the water column. You must have patience. The plants can take time to respond but when you find that sweet spot between PAR, co2 and nutrients the growth will follow.
Use drop checkers and ph meters dubiously and observe with your eyes. They are your best test kit, they do not lie to you and you do not have to pay to use them.
Good luck