Won't have an indicator for ideal levels, you'll have an indicator for a starting point which you'll need to tweak by visually observing the tank and it's inhabitants.Go for the drop checker. You can find some good deals online, I know eBay has some. Take the guess work out of it, the amount of CO2 needed can vary as plants get added, grow ,and get trimmed back... You'll have a visual indicator every day where you can instantly see if you have ideal levels.
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