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Discussion Starter · #1 ·
Say you have a planted tank that is moderatly stocked with fish.
How do fish react when their tank is supplemented with CO2?
Wouldn't this poison the fish, or do the plants convert this CO2 before it reaches a toxic level?

Just something I've been curiuos about while planning my setup. Hope yall are having a pleasent day!
 

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Fish will be fine and act normally as long as the CO2 concentration isn't too high. I've found one of the easiest and most accurate ways to monitor CO2 concentration is by using a drop checker (If you look around the forum you'll find much better explanations of them than I can give.). It's also pretty cheap which is nice in what can become an expensive hobby.
 
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