You can get by doing this with plants that dont need CO2 to begin with, like crypts, swords, java ferns, etc. And it can also be useful to carpet faster some of the less demanding carpeting type plants like dhg and stauro, etc.
But colorful stems or anything that generally needs CO2 will quickly revert back to a poor state. You'll also need to drastically reduce the light for a while once the co2 stops to avoid an algae nightmare.
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