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I have CO2 in my tank with shrimp and the shrimp are fine and do regualrly reproduce. The problems with CO2 is that people tend to use too much or use a system that doesn't have a stable output.Also Co2 and shrimp usually don’t mix...
There is plenty of CO2 in an aquarium. It is produced continuously by fish, snails, shrimp and bacteria. Bacteria produce heaps of it. You also get CO2 coming into the tank from the atmosphere.