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CO2 deficiency symptoms that mimic other nutrient deficiencies is an interesting concept. El natural aquariums don’t have CO2 injection, and the plants grow fine. Other factors at work?
 

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I like the sensible answers from both of you :) Furthermore, sufficient fish load can provide adequate CO2 for plants in a NPT. Plants also are capable to utilize other carbon sources in the water and fish wastes, and I suspect some plants are more efficient than others to take advantage of the alternative carbon sources.

There is no question that CO2 deficiency is real, especially when the demand exceeds the supply. Slow growth, gangly branches, and yellow leaves are the symptoms I recently read from various sources. So yeah, yellow leaves would be similar to N deficiency.

Hi Neil, by saying “fine” I meant sustained, not too fast but healthy growth when a plant treated with organic fert in good soil as compared to a plant put exclusively on steroid a.ka. Miracle Grow :D

Wayne
 
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