CO2 Drop Checkers


The best way to monitor CO2 levels in your tank. A drop checker will change colour to display how much or how little CO2 you have in your aquarium water.  They're such a useful piece of kit that every hobbyist who is running a planted aquarium with pressurised system should have one. In terms of positioning your drop checker make sure you place it towards the bottom of your tank and not at the top (like most do!).

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