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is there a point in adding a diy Co2 to my 10 gallon?
CO2 helps at all lighting levels, but is not required below 2w/g. And for a 10G tank, DIY is all that's needed. But also remember, if adding CO2 under lower lighting, you may also need to add ferts, as the increase in CO2 uptake equals increased uptake of all other ferts.
Even though it is the same planet, underwater is a whole different world.