how much c02 is needed???

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Yellow drop checker = Less CO2
Green drop checker = ok
Blue drop checker OR algae = more CO2

Can also use pH and KH to get the right amount, 30 ppm.
 
Best place to get them is ebay. Like 3 for $10. You need the 4 dkh standard (doable at home) and standard pH drops as well.
 
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