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Drop checker help!


ShrimpSA
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Okay so I got a drop checker... it goes greenish to yellow then I switch off my CO2 but it never goes blue again. I also measure pH then its greenish-yellow but a day later if I measure the pH is blue again but the drop checker never changes back. It is permanently yellow, even after 3 days. I am using 4dkh fluid with pH fluid to measure the CO2 levels. It just seems like the drop checker gets stuck on yellow and never goes blue even though the CO2 levels are low.

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