Why is my drop checker always yellow after many hours without co2 : r/PlantedTank
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Why is my drop checker always yellow after many hours without co2
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How bad is a yellow drop checker for fish?
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More Convenient - The mixed carbon dioxide drop checker solution does not need to consider the ratio of water to solution, just use it directly,
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Is this a 30ppm green on my drop checker? : r/PlantedTank
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