Filtering water at home has become easier with a variety of at-home filtration systems, helping us kick the bottled water habit for good. But while we know filtered water is good for us to drink, have you thought about using it in your fish tanks? Tap water can have high levels of chlorine and ammonia, which are often used in water treatment plants. This can change the PH levels of the water, which affects the quality of living for fish. Using filtered water in fish tanks can go a long way toward giving our aquatic friends a healthy, long and happy life.