Water is as important to fish as air is to us. Knowing the basics of water care and testing will help you keep your fish healthy and lead long lives. This reference list includes a variety of articles and videos about aquarium water care, including ammonia, nitrite, nitrate, pH, and phosphates. If you don't find the information you need, please email me at freshaquarium.guide@about.com with your questions.Photo © Heidi Gomez
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