Planted Tank Guru
Join Date: Sep 2011
Location: Willimantic, CT
To be honest though, I'm not sure such a small tank would need CO2. If you minimize surface agitation you'll be keeping a lot of CO2 in the tank, especially at night. You can test this somewhat accurately if you measure the pH during the day, and again right before the lights/sun comes on/out. The pH will drop lower as the CO2 increases.
Fish Shrimp tanks are like cups of coffee, one is never enough.
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