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You know everyone likes to stress that you *must have* a CO2 level of at least 30 ppm. I believe it's Hoppy who has proven that you can do a CO2 injection that just mildly bumps your CO2 to at most 10~13 ppm, and you'll still have healthy plants at moderate light levels.

I'm here to say that I grew some pretty demanding plants on marginally sized 24/7 DIY injection using bell jars and other less efficient CO2 fertilization schemes. Mature and healthy substrates do not get the credit they are due for their part in a planted tank. Not to say that 30 ppm isn't a good level to shoot for, but depending on your own water's level of KH and general hardness 30 ppm isn't a given.
 
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