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CO2- do I need it.

I have 75 gallon tank, about 50 fish, average length of 1,5 inches. The 
tank has lace plant, 2 Amazon sword plants, Vals, Bacopa, Moneywort, Hygro, 
Cryptos. Do I need add CO2 to this tank ? Can the fish produce enough CO2 ? 
My fish are healthy and plants looks healthy. Please advise.