Perhaps someone else can add their opinions too... but I think it is extremely easy to overdose a 3 gallon tank with DIY CO2 and kill all inhabitants. Depends a little on the efficiency, how much CO2 is dissolved in water and how much surface agitation and gas exchange takes place.
It is very difficult to keep water parameters fairly constant in a miniature tank like this. Adding CO2 is possible, but will make it even more complex and prone to sudden changes.
I am admiring beautiful nanos. The smaller a tank, the more difficult it is to maintain stability... nuff said.
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