I use a drop checker just for visual confirmation that everything is working normally. Other than that I don't really see a need for any other type of monitoring. I replace my tanks well before dump-offs. The drop checker is borderline yellow at the end of each day and a nice lime green every morning, so I should have an excess of CO2 given that its a gradual buildup over the course of the day. I also clean and replace the fluid at each water change. That and to be apart of the club I have to have one piece of ADA equipement. :P
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I mix my shrimp species and there ain't a damn thing you can do about it! 
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