CO2 always at least 1 point lower than tap?
I've tested my tank with drop tests and a cheap pH pen. According to those my tap water is 7.5 pH. I have quite a lot of aquasoil, some driftwood and seiryu stone in the aquarium. Because of mostly the aqua soil I believe my pH is lowered.
I'm trying to figure out my CO2 levels. I even bought a CO2 test kit but the results it gives are rubbish (claiming +40 ppm CO2 after water change). My drop checker is always green, or lime green, but never yellow.
Before CO2 is on, my pH is at 6.6 so almost 1 point lower than tap - does this mean I should add CO2 to drop it to 5.6 to get 30 ppm? That seems a bit crazy, since according to the old tables with my KH (2 from tap, 3 in tank) and pH 6.2 during injection it would mean I already have close to 60 ppm CO2. The drop checker color is also quite close to turning yellow. Shrimp in the tank, so need to pay attention.
120 liters, EI & CO2 and medium lights.
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