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tester

  1. New to Planted Aquariums
    I have a heavily planted 90g tank and I am using a pressurized CO2 system. I am using a drop checker to check my CO2 levels. I see people on here talking about 30 ppm and so on. What kind of tester do they use? I would really like something that allows me to accurately test my CO2 but my LFS...
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