Proper pH of the majority of the freshwater aquatic species is from 6.5-8.5. in the environment of water, if the pH value is too low, the water quality exceeds the allowable limit (sour water) usually have many CCO2, lack of oxygen O2, on the other hand the harmful toxic algae, bacteria grow in anaerobic environments, the microorganisms that cause disease also develop, the tang of the number , harmful to aquatic animals.
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