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Fish and CO2
A certain hypothetical 50 gallon aquarium contain a good growth of "easy to
grow" plants, such as swords, vals, crypts, and hygrophila. It gets 2.5 watts
per gallon of light. PH is 7.0, GH and KH are both four degrees.
CO2 is added at the rate of 8 - 10 bubbles per minute. It contains no fish.
If the CO2 were discontinued, how many zebra danio-type fish would be needed
to make up for the discontinued CO2?
Thanks in advance.