I am about to upgrade the lower end pH controller on my girlfriend's CO2 injected planted tank with a nicer model, at which point I will find myself with a perfectly functional pH controller and no real use for it.. I figured I would just stick it into my 110G cichlid tank and read the pH. And then I thought, can I use this to signal a need to do a water change to myself? We know pH in a tank drops over time, so I can set it to light up a light bulb on my desk if it drops below a set point.
My question to you guys is, would it work? How much does pH drop between your typical water changes? What ΔpH should my water change alarm be set for, 0.1, 0.2? Or does it only start to drop when the tank is already pretty far gone?
My question to you guys is, would it work? How much does pH drop between your typical water changes? What ΔpH should my water change alarm be set for, 0.1, 0.2? Or does it only start to drop when the tank is already pretty far gone?