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How much are different varieties of koi affected by the pH and carbon dioxide in the water?
How much do the pH and carbon dioxide in the water affect your koi? (1) The effect of pH: To test the pH of the water, you can use pH test strips, or you can judge by the behavior of the koi. For example, when the water is acidic, the respiration of the koi decreases, and they show slowed activity...