The CO2 is being made by a yeast, sugar, water mixture. Couldnt tell you if it makes a dif, I dont think theres really been a side by side comparison with and without CO2 mixtures. Either way its a fun little addon.
Here a tutorial:
http://www.rollitup.org/blogs/blog45...se-plants.html
Edit: our new seeds arrived today. Took a little long but they all got here.


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