I currently use a pH controller to control my CO2. It's set to run when the pH hit 6.1 and brings it back down to 6.0. I'm having ok results with this method so far, but is using a timer a better method? I've always worried about fish and the 24 hour pH swing that results from a timer, but I suppose such results occur to some degree naturally as well. The problem I don't like with the pH controller is you tend to lose calibration after a certain point and if you aren't on top of it you are then losing CO2 levels possibly, or gaining too much CO2 as the probe gives false readings. Any thoughts? Really tempted to use the timer to see how that works, but really don't want to upset the balance if there's no point to it.
Last edited by a moderator: