family members. According to Sherlie Sharp, there is no “normal” pH that applies to all fish. Because fish originate in ponds, rivers, streams, lakes, and oceans that have different pH levels, their needs are different. Saltwater fish prefer an alkaline pH of 8.0 or above. Freshwater fish thrive in a range lower than that, somewhere between 5.5 and 7.5, depending on the specific species. Changes in the pH, especially sudden changes, can prove harmful or even fatal to fish . As the pH rises it increases the toxicity of chemicals such as ammonia. It is an
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